Sleep deprivation: are you ignoring the signs?
"I just thought it was normal"
One of the most common things people say to me when we’re talking about sleep and daily life.
People who are functioning, showing up, getting through their days. But underneath it all… they're exhausted. Not the kind of exhausted that puts you in bed for a week — the kind you learn to live with.
The kind you've become so good at masking, you've almost convinced yourself it's just who you are.
But here's what years of working with people on sleep has shown me: the body whispers before it screams.
And when it comes to sleep, we're conditioned to ignore the whispers — until it's too late, the burnout has hit, and recovery takes far longer than it needs to.
Being tired is not a personality
Most clients don't come to me saying they're sleep deprived. They come saying:
"I've always been a bad sleeper."
"I'm an overthinker."
"I can't get going until I've had a few coffees."
"My brain just doesn't switch off."
These aren't fixed personality traits. They're signs of chronic sleep deprivation — and a belief that it's just normal life.
It's not. These are not experiences you have to simply endure. As a society, we've normalised the struggle and expect people to carry on — quietly unravelling behind closed doors — until the body forces the issue. You deserve better than waiting for that moment.
What actually is sleep deprivation?
Sleep is not a state of nothingness. It's an active, deeply restorative process. While you sleep, memories are sorted and stored, emotions are processed, cells and muscles are repaired, hormones are regulated, and energy is restored.
When you don't get enough — whether that's quantity, quality, or both — your body and brain don't simply feel tired. They adapt. They find ways to keep you going. And those adaptations, over time, make things worse.
The signs aren't always obvious. In fact, some of the most telling ones are things you've probably written off entirely.
10 (maybe surprising) signs you’re sleep deprived
1 - You fall asleep the moment your head hits the pillow
This feels like a superpower — the sign of a "good sleeper". But it's actually a red flag.
It should take 10–20 minutes, on average, to drift off. Falling asleep instantly signals your body is carrying a significant sleep debt. (1)
2 - You're unusually emotional — or completely flat
Poor sleep amplifies emotional reactivity. Small frustrations feel enormous. Patience disappears. You snap at the people you love most. Or you feel the opposite — completely numb, just getting through the day rather than actually living it.
"I thought it was just a stressful time" or "I assumed it was my hormones" — common phrases I hear. Then we improve sleep without changing anything else, and the emotional baseline shifts. The days are still busy, but they feel more manageable. (2,3,4, 20)
Sleep changes the lens we experience the world through, even when the world itself hasn't changed.
3 - You can't make decisions — or you've become impulsive
A sleep-deprived mind struggles with even the smallest decisions, leaving you feeling stuck and unproductive. Or you go the other way — acting impulsively, taking risks you normally wouldn't.
Without enough sleep, activity in the prefrontal cortex is reduced — the part of the brain responsible for strategic thinking, planning, and impulse control. The brain falls back on shortcuts and chases quick rewards. Every decision feels harder than it needs to be. (5,6,7,8, 20)
4 - You experience microsleeps
You zone out for a few seconds — while driving, in a meeting, mid-scroll. Your eyes are open but your brain has briefly gone offline.
These involuntary "switch-offs" are the sleep-deprived brain forcing rest whenever it can find an opportunity. And as you can imagine, they can be genuinely dangerous. (9,10)
5 - You're always hungry — especially for sugar and quick energy
Reaching for one more biscuit, coffee, or energy drink more than usual?
Sleep regulates our hunger hormones. Deprivation raises ghrelin (the hunger hormone) and lowers leptin (the fullness hormone), leaving you craving high-sugar, high-fat foods — not because you lack willpower, but because your biology is demanding fast fuel. (11,12,13, 20)
6 - You're unusually clumsy or accident-prone
Dropping things. Walking into furniture. Small mistakes you don't usually make.
It's easy to blame stress or distraction — but research, particularly in sports science, consistently shows that reaction times, coordination, and physical performance all decline meaningfully with poor sleep. (14)
7 - You feel unmotivated — even for things you care about
You have ideas, you want to do things — but you can't get started.
Sleep deprivation reduces energy, drive, and the mental capacity to initiate tasks. The things that usually excite you start to feel like effort. And when that happens consistently, it can quietly chip away at your sense of identity and purpose. (15)
8 - You keep getting ill
You're picking up every cough and cold going around — and you can't seem to shift them.
Sleep is critical for immune function. Your immune system does much of its repair work while you sleep, and chronic poor sleep leaves it less equipped to fight off viruses and recover from illness. (16,17)
9 - Your skin isn't healing or recovering well
Breakouts linger. Cuts take longer to heal. Your skin keeps flaring up.
A significant amount of human growth hormone is produced during deep sleep, helping cells to repair and regenerate. Sleep deprivation can start to show on the outside — not just be felt on the inside. (18,19)
10 - You're fixated on your next chance to sleep
You wake up each morning already thinking about when you can next get back into bed. You say "I’ll catch at the weekends" or "I just need to get through this and I can rest on holiday."
When your life revolves around future sleep, it's a clear sign you're not getting enough now. And if you don’t break the cycle, it only deepens.
But could it be something else?
If you recognised yourself in some of these, that doesn't automatically mean sleep deprivation is the only cause. These signs can overlap with stress, nutrition, mental health, and other lifestyle factors.
But here's what I know from experience: sleep is often the foundation. And when it's off, everything else becomes harder to manage.
Something has to shift…
Many people live in a state of low-level sleep deprivation without realising it — because it's become accepted, even expected. But normal doesn't mean optimal. And it doesn't mean things can't change.
Ready to understand your sleep?
If you're noticing these patterns and wondering whether sleep is playing a role, that's exactly where the work begins.
At The Sleep Shift, I help you understand your unique sleep — not by chasing perfection, but by making realistic, sustainable changes that actually fit your life.
"What am I currently accepting as normal that might actually be a sign I'm overtired?"
Start there. And if you're ready to explore it further — I'm here.
References:
https://www.sleepfoundation.org/how-sleep-works/sleep-latency
Sullivan E.C. et al. (2025) Disentangling sleep’s role in emotion processing. Neuropsychologia 219:109269.
Tempesta D. et al. (2018) Physiological review: Sleep and emotional processing. Sleep Medicine Reviews 40:183-195.
Vandekerckhove M. and Wang, Y. L. (2017). Emotion, emotion regulation and sleep: An intimate relationship. AIMS neuroscience 5(1):1–17.
Whitney P. et al. (2015) Feedback blunting: Total sleep deprivation impairs decision making that requires updating based on feedback. Sleep 38(5):745-754.
Khan M.A. and Al-Jahdali H. (2023) The consequences of sleep deprivation on cognitive performance. Neurosciences (Riyadh, Saudi Arabia), 28(2): 91–99.
Yu S. et al. (2024) Insomnia and impulsivity: A systematic review and meta-analysis. Sleep 47:A73
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Boyle L.N. et al. (2008) Driver performance in moments surrounding a microsleep. Transportation research. Part F, Traffic Psychology and Behaviour 11(2):126-136.
Poudel G.R. et al. (2014) Losing the struggle to stay awake: divergent thalamic and cortical activity during microsleeps. Human Brain Mapping 35(1):257–269.
Akhlaghi M. and Kohanmoo A. (2025) Sleep deprivation in development of obesity, effects on appetite regulation, energy metabolism and dietary choices. Nutrition Research Reviews 38(1):4-24
Zhu B et al. (2019) Effects of sleep restriction on metabolism-related parameters in healthy adults. A comprehensive review and meta-analysis of randomized control trials. Sleep Medicine Review 45:18-30.
Taheri S. et al. (2004) Short sleep duration is associated with reduced leptin, elevated ghrelin, and increased body mass index. PLOS Medicine 1(3):210-217.
Xu A. et al. (2026) Sleep deprivation disrupts postural balance and sensorimotor integration: A combined psychophysiological-behavioural analysis. Neuroimage 325:121667.
Jurgelis M. et al. (2022) Sleep restriction reduces cognitive but not physical motivation. Nature and Science of Sleep Journal 4:2001-2012.
Garbarino S. et al. (2021) Role of sleep deprivation in immune-related disease risks and outcomes. Communications Biology 4:1304.
Spiegel K., Sheridan J.F. and Van Cauter E. (2002) Effect of sleep deprivation on response to immunization. JAMA 288(12): 1471-2.
Sadur A. et al. The Sleep-skin axis: Clinical insights and therapeutic approaches for inflammatory dermatologic conditions. Dermato 5(3):13.
Samaniego M. et al. (2025) Sleep in dermatological conditions: A review. JAAD 4:6-43.
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