Most adults need seven to nine hours of sleep, but the number matters less than the quality, and that is why you can sleep eight hours and still wake up tired.
(And why five hours isn’t cutting it)
We live in a world that glorifies being busy. Culturally, we equate long hours with success, and often those in positions of power live by the moniker, ‘sleep is for the weak’. You’ve probably heard someone say, “Oh, I only need five hours of sleep, I function fine.” The thing is, most of us don’t. And “fine” isn’t really the goal, is it?
Most adults need somewhere between seven and nine hours of sleep to function at their best. Not just to get through the day, but to think clearly, stay patient, and actually feel like themselves. That’s what the research says, and it lines up with what I see every day in my work with clients. Yet so many of us are walking around in a state of quiet exhaustion, convinced this is just what adulthood feels like.
The problem is that sleep deprivation doesn’t always hit you like a wall. It sneaks up gradually. You start staying up later, convincing yourself you’re doing something productive – folding laundry, scrolling, finishing emails – and then you start feeling “used to it.” Parents of young children are especially guilty of this, employing ‘revenge bedtime procrastination’ just to get a little time alone at the expense of their sleep and overall well-being. What ends up happening is that your body begins to adjust to a lower baseline, making it easy to forget what rested actually feels like.
In a University of Pennsylvania study published in Sleep, adults who slept just six hours per night for two weeks performed as poorly on reaction-time tests as those who had been awake for two full days (Van Dongen et al., 2003). The scary part? Most of them said they felt “fine.” They didn’t notice the decline.
That’s what makes chronic sleep restriction so deceptive: it dulls your self-awareness. You lose sight of how much better you could feel if you just got the rest you need.
But the effects of sleep loss go far beyond focus and mood. It impacts your body, too.
When you don’t get enough sleep, your body produces more cortisol and less growth hormone, which is a combination that slows recovery and reduces muscle-protein synthesis. Research shows that chronic sleep restriction can blunt muscle repair and lower testosterone, both of which are key to strength and energy (Dattilo et al., 2011). So, your 5am training session may be doing more harm than good if you’re not hitting the hay until close to midnight, for example.
A systematic review in Sports Medicine found that athletes who slept less performed worse in nearly every category. Endurance, speed, accuracy, and reaction time all dropped with even modest sleep loss (Fullagar et al., 2015).
And it’s not just about performance. Sleep deprivation also disrupts immune function and increases inflammation throughout the body, which over time contributes to heart disease, metabolic disorders, and other chronic conditions (Irwin, 2015).
The Culture of Exhaustion
Somewhere along the line, tiredness became a badge of honour. It’s woven into the fabric of our culture – especially for parents and high-achievers. The idea that running on empty means you’re doing enough; you’re committed; you’re strong. It looks great on paper, but in practice, it has the potential to cause both short- and long-term harm.
The reality is that chronic exhaustion isn’t strength, it’s survival mode. It clouds your thinking, raises stress hormones, weakens immunity, and shortens your fuse with the people you love most. You might feel like you’re “pushing through,” but instead you’re operating at a fraction of your potential.
When I work with clients, one of the biggest mindset shifts we talk about is moving from “I can get by” to “I deserve better.” Because you do.
So, how much is enough?
While seven to nine hours is the general recommendation, the exact number depends on your age, lifestyle, and chronotype (your body’s natural sleep rhythm). Interestingly, research also shows that women generally need about 10–20 minutes more sleep per night than men, likely because their brains engage in more complex multitasking and emotional processing during the day. Hormonal fluctuations throughout life can also impact sleep quality, making rest even more essential.
Some people genuinely do well at seven; others need closer to nine. The key isn’t just the number of hours, but the quality of your sleep.
If you’re waking multiple times a night, falling asleep late, or relying on caffeine to get through the morning, your sleep quality probably needs work – even if you’re technically “in bed” for eight hours.
Start by asking yourself:
- Do I wake feeling refreshed, or do I immediately crave coffee?
- Do I hit a wall in the mid to late afternoon?
- Am I irritable, foggy, or forgetful by the end of the day?
If you’re nodding yes to any of these, your body is trying to tell you something.
Quick Wins to Improve Rest
You don’t have to dedicate every waking moment to planning your sleep in order to feel better. A few small changes can make a real difference.
- Hydrate for deeper sleep.
Dehydration increases nighttime cortisol and can lead to restless sleep. Keep water nearby during the day and taper off in the evening to avoid frequent wake-ups. If you’re part of The Recharge Protocol, revisit the hydration tracker from Week 2 – it’s a game changer for consistent energy and better rest. - Try evening breathwork.
Gentle breathwork calms the nervous system, helping your body transition out of “go” mode. If you haven’t already, try the 4-7-8 method or left-nostril breathing. Both activate your parasympathetic response, the body’s built-in relaxation switch. - Eat for sleep.
Your evening meals can set the tone for how you sleep. Focus on foods rich in magnesium, tryptophan, and complex carbs (think salmon, oats, or almonds). Avoid ultra-processed snacks and late-night caffeine. You can dive deeper into this in my article on foods that support sleep, or in The Recharge Protocol module on food, blood sugar, and sleep. - Set a bedtime alarm. We set alarms to wake up, but not to wind down. Try setting one 30 minutes before you want to be asleep. It’s a cue to start closing tabs, turning off lights (blue light delays melatonin production), and giving your body time to shift gears.
- Watch your caffeine timing. Caffeine lingers in your system for far longer than most of us realize. Even that 3pm cup can keep you wired when you’re trying to fall asleep. Try switching to decaf or herbal tea after noon.
- Respect your chronotype. If you haven’t already, take The Recharge Protocol Chronotype Quiz to learn whether you’re a Sun, Root, Moon, or Rain type. It’ll help you understand your natural energy rhythms and structure your day – and sleep – accordingly.
The Cost of “Good Enough” Sleep
The research is clear: chronic sleep deprivation affects nearly every system in your body. It raises cortisol, lowers immune function, increases inflammation, and disrupts hormones that regulate appetite and mood. Over time, it can even increase the risk of metabolic issues and heart disease.
But the thing is that most people don’t need studies to tell them this. They feel it. They just don’t know how to fix it without overhauling everything. That’s where a holistic approach comes in: supporting the body, mind, and environment so that sleep becomes a byproduct of balance, not another task to check off.
You Deserve More Than “Fine”
There’s a moment I see often with clients, when they realize that the exhaustion they’ve accepted as normal isn’t normal at all. When they get their first few nights of real rest, it’s like they come back to life: their mood lifts, their patience returns, their thoughts feel clear again.
If you’re ready to make better rest your reality too, The Recharge Protocol was built for exactly this – to help you understand your chronotype, rebuild healthy rhythms, and finally feel rested again. Or, if you’d rather start with a one-on-one conversation, book a clarity call and we’ll figure out what’s standing in the way of your best sleep.
You deserve to feel good again. Let’s make that your baseline.
References
- Dattilo, M., Antunes, H. K., Medeiros, A., Monico-Neto, M., Souza, H. S., Lee, K. S., & Tufik, S. (2011). Sleep and muscle recovery: Endocrinological and molecular basis for a new and promising hypothesis. Medical Hypotheses, 77(2), 220–222. https://doi.org/10.1016/j.mehy.2011.04.017
- Fullagar, H. H. K., Skorski, S., Duffield, R., Hammes, D., Coutts, A. J., & Meyer, T. (2015). Sleep and athletic performance: The effects of sleep loss on exercise performance, and physiological and cognitive responses to exercise. Sports Medicine, 45(2), 161–186. https://doi.org/10.1007/s40279-014-0260-0
- Irwin, M. R. (2015). Why sleep is important for health: A psychoneuroimmunology perspective. Annual Review of Psychology, 66, 143–172. https://doi.org/10.1146/annurev-psych-010213-115205
- Van Dongen, H. P. A., Maislin, G., Mullington, J. M., & Dinges, D. F. (2003). The cumulative cost of additional wakefulness: Dose–response effects on neurobehavioral functions and sleep physiology. Sleep, 26(2), 117–126. https://doi.org/10.1093/sleep/26.2.117
Is six hours of sleep enough?
For most people the answer is no, even if it feels like it is. What usually happens is that you adjust to running low, and over time your body drops the bar for what “normal” feels like. You stop noticing how tired you actually are. Think back to that study cited earlier, where people getting six hours a night tested as impaired as if they’d been awake for two full days. Every one of them thought they were fine. If you’re one of the many who pride themselves on needing little sleep to function, it may be worth a sleep reset to see how you feel with a few more hours!
Why am I still tired after eight hours of sleep?
Eight hours in bed and eight hours of good sleep are two very different things. You can hit the number and still drag through the next day if the quality underneath it isn’t supporting your need for rest. Your sleep quality could be impacted if you’re waking several times a night without even realizing it; perhaps your blood sugar dips in the early morning hours; or your nervous system is overloaded and not powering down when you do. You could be one of the many adults who don’t realize that their late-afternoon coffee is still working through their system at midnight. The hours are the easy part to count. What’s happening during those hours is what’s more important, and that’s usually where the real problem sits.
Do women need more sleep than men?
Generally, yes, though the honest answer is more complicated than a number. The research points to women needing roughly ten to twenty extra minutes a night, likely because their brains do more multitasking and emotional processing through the day. But here’s the part that often gets left out: it isn’t just how much sleep women need, it’s how much they actually get to keep. Think about who tends to get up in the night with a newborn, or with a sick toddler, or lies awake running the mental list for the whole household. That’s a 24/7 job, and it cuts straight into the deep, restorative hours that matter most. So even once you account for that bit of extra sleep women need, plenty of mothers are still coming up short, because the math never counted the interruptions in the first place. If that’s you, you’re not imagining how tired you are. You’re running a real deficit.
How do I know if I’m sleep deprived?
Your body will usually tell you, if you’re able to listen. The everyday signs are the ones from earlier in this article: you wake up reaching for coffee before you’re properly awake, you hit a wall in the mid to late afternoon, you’re short-tempered or foggy by the time evening rolls around. Another common sign that is often missed as overtiredness is being able to fall asleep the moment your head hits the pillow. A lot of people see this as a flex, but a short sleep latency is equally as problematic as a long one. One of these factors on its own, especially if it’s temporary, is nothing to worry about. Several of them, week after week, is a pattern worth taking seriously.
