I hear it so often from the women in my practice: “I’m tired all the time… so why can’t I get good sleep?”

It’s frustrating to feel exhausted all day only to find yourself lying awake at night. You finally crawl into bed after a long day. The kids are asleep. The dishes are done (maybe). Perhaps you’ve even resisted the urge to scroll your phone.

“It’s frustrating to feel exhausted all day only to find yourself lying awake at night.”

And then your brain suddenly decides it’s time to replay conversations from three days ago, revisit your to-do list, solve tomorrow’s problems, and contemplate every life decision you’ve ever made.

Sound familiar?

Sleep is one of the most important things we do for our health. It influences everything from hormone balance and metabolism to immune function, brain health, mood, and longevity. And yet, for something so fundamental to our survival, it can often feel surprisingly elusive.

The truth is that many women aren’t struggling with sleep because they’re doing bedtime wrong. They’re struggling because modern life has become increasingly incompatible with the biology required for restorative sleep.

“Modern life has become increasingly incompatible with the biology required for restorative sleep.”

We’re carrying a tremendous amount these days. Careers. Families. Caregiving responsibilities. Financial pressure. Relationship challenges. Health concerns. Constant notifications. Endless information. The emotional weight of events happening not only in our own lives, but around the world.

Our brains were never designed to absorb the suffering, crises, opinions, tragedies, and breaking news of millions of people before breakfast.

Many of us are moving through our days with nervous systems that never fully get the message that it’s safe to power down.

As a functional medicine physician, I’ve come to view sleep as one of the body’s most honest forms of feedback. When sleep starts to suffer, it’s often a clue that something deeper deserves our attention.

Yes, blue light matters. Sleep hygiene matters. A cool dark room matters.

But for many women, there’s a lot more to the story than just that.

Sleep isn’t designed for our modern world

One of the biggest shifts I’ve made in how I think about sleep is recognizing that many women aren’t failing at sleep because they’re bad at it. They’re trying to sleep within environments that are increasingly working against their biology.

For most of human history, darkness was actually dark. Nights were quieter. Work had a hard stop. Information was limited and more digestible. People weren’t carrying the weight of global news cycles, social media feeds, overflowing inboxes, financial stress, and the emotional labor of modern life into bed with them every night.

Today, many of us wake up to notifications before we’ve even seen sunlight. We check devices before our feet hit the floor. We absorb headlines, social media updates, work demands, family responsibilities, and an endless stream of information before our brains have fully registered that we’re even awake. And then at night, we’re expected to simply turn it all off.

The problem is that the body doesn’t work like a light switch.

“The problem is that the body doesn’t work like a light switch.”

Sleep isn’t something that begins when we get into bed. In many ways, sleep starts the moment we wake up. Throughout the day, the brain is constantly collecting information about whether it’s daytime or nighttime, whether it’s time to be alert or time to recover.

This is one reason I think so many women feel tired but wired. They’re physically exhausted. Emotionally exhausted. Mentally exhausted. And sometimes, they’re carrying a level of cognitive and emotional load that far exceeds what their bodies have the opportunity to recover from.

Your nervous system doesn’t know you’re in bed

One thing I often explain to patients is that the brain prioritizes safety before sleep.

“The brain prioritizes safety before sleep.”

From an evolutionary perspective, sleep is a vulnerable state. When we’re asleep, we’re less aware of our surroundings and less able to respond to potential threats. Because of that, the brain is constantly gathering information about whether it’s safe enough to fully power down.

The challenge is that many modern stressors don’t resolve quickly.

The body often responds to financial pressure, relationship conflict, caregiving responsibilities, workplace stress, grief, uncertainty, and chronic overwhelm in remarkably similar ways to physical danger. The nervous system doesn’t always distinguish between being chased by a predator and feeling chronically overwhelmed, unsupported, or unsafe.

And if the brain believes there’s still a problem that needs solving, sleep can become surprisingly difficult.

“If the brain believes there’s still a problem that needs solving, sleep can become surprisingly difficult.”

I see this often in women who tell me they finally have a moment to themselves at the end of the day, only to find their minds racing the second their heads hit the pillow.

Their bodies aren’t doing anything wrong. Their bodies are doing exactly what they’ve been trained to do all day long: Stay alert, stay alive.

Hormonal shifts can impact sleep

Hormones play a significant role in sleep. One of the biggest misconceptions I see is that sleep problems are simply a normal part of your hormones shifting as you age. In reality, sleep is often one of the first places women notice hormonal shifts showing up.

“One of the biggest misconceptions I see is that sleep problems are simply a normal part of your hormones shifting as you age.”

Progesterone, for example, has calming effects on the brain and nervous system. As progesterone begins declining during perimenopause, many women find they don’t sleep as deeply, wake more easily during the night, or suddenly struggle with insomnia despite never having experienced it before.

Estrogen influences sleep too. It helps regulate body temperature, mood, neurotransmitters, and even how the brain moves through different stages of sleep. When estrogen fluctuates, women may experience night sweats, increased anxiety, more frequent waking, or a sense that they slept for eight hours but still don’t feel rested.

This is why so many women tell me: “I’ve never had sleep problems before.”

Then seemingly overnight, they find themselves waking at 3 a.m., struggling to fall asleep, or feeling exhausted despite spending enough hours in bed.

For some women, sleep disruption becomes one of the earliest signs that hormones are shifting. And because these changes often begin years before menopause itself, many women don’t initially realize hormones could be part of the conversation.

It’s also important to remember that hormones affect sleep long before perimenopause enters the picture. Women in their 20s, 30s, and early 40s may notice sleep changes related to stress, blood sugar dysregulation, thyroid function, fertility challenges, postpartum recovery, menstrual cycle fluctuations, or conditions like PCOS. In these cases, sleep often becomes an early clue that something else in the body may need attention.

This is one reason I rarely look at sleep as an isolated symptom. It’s often connected to a much larger hormonal and metabolic story.

Blood sugar could be keeping you awake

One of the most overlooked contributors to poor sleep is blood sugar regulation. It’s one of those clues that reminds us sleep is rarely just about sleep.

Many people think of blood sugar as something that only matters if you have diabetes. In reality, blood sugar affects everyone. It helps regulate energy, mood, cravings, metabolism, hormone function, and yes, sleep.

“Many people think of blood sugar as something that only matters if you have diabetes. In reality, blood sugar affects everyone.”

Here’s where it gets interesting.

While you’re sleeping, your body is still working hard behind the scenes. It’s regulating hormones, repairing tissues, consolidating memories, supporting immune function, and maintaining stable energy levels for the brain.

If blood sugar drops too low overnight, the body doesn’t simply ignore it.

Instead, it treats that drop as a potential threat and responds by releasing stress hormones like cortisol and adrenaline to bring blood sugar back up. The result can be a racing heart, a sudden awakening, or that frustrating experience of being wide awake at 3 a.m. despite feeling exhausted.

This is one reason I pay attention when patients tell me they consistently wake between 2 and 4 a.m. and struggle to fall back asleep.

Before you go raiding your fridge for that middle-of-the-night snack, remember it’s more nuanced than just eating. I find that women who are under-eating, skipping meals, relying heavily on caffeine, not eating enough protein, or experiencing significant blood sugar swings during the day are more likely to experience disrupted sleep at night.

The goal is helping the body feel metabolically supported enough that it doesn’t need to sound an alarm at 3 a.m.

Artificial light can disrupt your sleep cycle

Blue light gets a lot of attention, and for good reason. Light is one of the most powerful regulators of our circadian rhythm, the internal clock that helps coordinate sleep, hormone production, metabolism, immune function, and countless other processes.

Today, many of us do the opposite of what nature intended. We spend our days indoors under artificial lighting and our evenings under bright screens, televisions, overhead lights, and illuminated devices. Research has shown that exposure to artificial light at night can suppress melatonin production and disrupt the body’s natural sleep-wake cycle.

The key to understanding light is remembering that our brains still rely on light signals to understand what time it is. Your evening wind-down-and-scroll routine may feel relaxing, but biologically it’s often sending the brain mixed messages about whether it’s time to be alert or asleep.

“Your evening wind-down-and-scroll routine may feel relaxing, but biologically it’s often sending the brain mixed messages about whether it’s time to be alert or asleep.”

Ironically, some of my greatest lessons about circadian rhythms came when I became a mom. During sleep training with my son Koa, I found myself diving deeply into the science of light exposure, darkness, and sleep cues. It was fascinating to watch how responsive children (yes, even babies) are to these signals.

One of the simplest changes I often recommend is paying attention to the amount of light you’re exposed to after sunset. That includes televisions, phones, bright overhead lighting, and even night lights. If you need light at night, dimmer, lower, and warmer is generally better than overhead, bright, and blue-toned. I love using red light, amber bulbs, and even candlelight after the sun goes down.

Not all sleep is created equal

One of the reasons sleep can feel so confusing is that hours spent in bed don’t always translate into restorative sleep.

Throughout the night, we cycle through different stages of sleep, including light sleep, deep sleep, and REM sleep.

“Deep sleep is particularly important for physical recovery, immune function, tissue repair, and metabolic health.”

Deep sleep is particularly important for physical recovery, immune function, tissue repair, and metabolic health. REM sleep plays a critical role in memory, learning, emotional processing, and brain health. Sleep experts generally estimate that adults spend about 1–2 hours each night in deep sleep and another 1.5–2 hours in REM sleep.

In recent years, wearable data has helped many people realize that sleep quality and sleep quantity aren’t always the same thing. This data doesn’t replace checking in with how you feel, which is why I always encourage people not to focus solely on a sleep score or exactly how many hours they’re sleeping. The goal is restorative sleep.

This means someone can technically get eight hours of sleep and still wake up feeling exhausted if those sleep cycles are repeatedly disrupted.

“This means someone can technically get eight hours of sleep and still wake up feeling exhausted if those sleep cycles are repeatedly disrupted.”

A snoring partner. A child with night terrors. A barking dog. Stress. Hormonal changes. Overnight blood sugar fluctuations. All of these can interfere with the architecture of sleep even when total sleep time appears adequate.

As a mom myself, I know firsthand that sleep doesn’t always happen in ideal circumstances. There have been seasons where Koa’s night wakings or night terrors made uninterrupted sleep feel like a distant memory.

Sometimes sleep struggles are biological. Sometimes they’re practical. Often they’re both.

Better sleep starts long before bedtime

One of the most important things I tell patients is that better sleep often begins long before the evening routine — it starts with how we support our bodies throughout the day.

“Better sleep often begins long before the evening routine — it starts with how we support our bodies throughout the day.”

The morning sunlight we get (or don’t get). The way we nourish ourselves. How stable our blood sugar remains. The amount of movement, stress, stimulation, recovery, connection, and rest we experience. Even the boundaries we establish around work, technology, and the demands of everyday life.

This is where circadian rhythms become so important. Our bodies are constantly collecting information about what time it is and what they’re being asked to do. Consistent sleep and wake times, exposure to natural light during the day, physical activity, and allowing the body to gradually wind down in the evening all help reinforce those biological rhythms.

Small changes can often make a meaningful difference. Limiting caffeine later in the day. Reducing late-night snacking. Dimming lights in the evening. Creating a wind-down routine before bed. Keeping the bedroom cool, dark, and quiet. Giving yourself permission to stop solving problems an hour before you’re supposed to be asleep.

For some people, additional insight may be appropriate. Depending on the situation, this may include working with a healthcare professional to evaluate medications, supplements, underlying sleep disorders, hormonal imbalances, or other contributors to disrupted sleep. But even when those tools are helpful, they tend to work best when they’re supporting a foundation of healthy sleep behaviors, rather than replacing them.

“Even when those tools are helpful, they tend to work best when they’re supporting a foundation of healthy sleep behaviors, rather than replacing them.”

Because sleep is ultimately a biological process. The body sleeps best when it receives consistent signals that it’s safe, supported, and able to recover.

I often tell patients that our inputs become our outputs. Sleep isn’t simply something that happens to us when we lay down for the night. It’s a reflection of what the body has experienced all day long.

There are a lot of reasons modern women struggle with sleep. We’re navigating careers, caregiving, relationships, changing hormones, constant stimulation, artificial light, stress, uncertainty, and information overload in ways our ancestors never had to.

“Our bodies are still trying to do something remarkable. They’re working to repair, recover, regulate, and prepare us for another day.”

And yet every night, our bodies are still trying to do something remarkable. They’re working to repair, recover, regulate, and prepare us for another day.

Sometimes we become so frustrated with our bodies that we forget they’re often doing the best they can with the information and circumstances they’re given.

So if you’re struggling with sleep, I hope this article leaves you with more curiosity than criticism. Often, our sleep is valuable feedback. It’s an invitation to pay attention to where your body may need more support.

Dr. Jaclyn Tolentino is a Board-Certified Family Physician and the Lead Functional Medicine Physician at Love.Life. Specializing in women’s health and hormone optimization, she has been featured in Vogue, The Wall Street Journal, and Women’s Health. As a functional practitioner and a breast cancer survivor, Dr. Tolentino is dedicated to uncovering the root causes of health challenges, employing a holistic, whole-person approach to empower lasting wellbeing. Follow her on Instagram here for more insights.