Sleep is not optional. It never was.
- The Sleep Fixer
- 3 days ago
- 6 min read
By Kerry Davies, The Sleep Fixer
Sleep is not a luxury.It is not a wellness trend.It is not something you “should probably get around to” when life becomes less busy.
Sleep is biology.
And yet most of us treat sleep like an optional extra. Something we will catch up on. Something we will sort out later. Something we can manage around work, parenting, stress, screens, deadlines and everything else that feels more urgent.
But your body was not designed to thrive without sleep.
This is not about frightening you. It is not about adding another thing to your list. It is about helping you understand what sleep actually is, why it matters, and why struggling with it does not mean you are broken.
Because often, once you understand sleep differently, everything begins to change.
Your body is designed to sleep
Not trained to.Not taught to.Designed to.
Sleep is one of the most ancient biological processes we have. It is as fundamental as breathing, eating and drinking. Evolution tends to strip away what is not needed, yet the biological drive to sleep has remained.
That tells us something important.
Sleep is not a weakness.Sleep is not laziness.Sleep is not time wasted.
It is a survival process.
Research supports this clearly. Work on cnidarians, including jellyfish and sea anemones, suggests that sleep-like states existed before the evolution of centralised nervous systems, meaning sleep may predate the brain as we know it.
A mathematical model published by researchers at Oxford University also concluded that in a changing environment, sleep behaviour achieves higher fitness than non-sleeping behaviour, leading the authors to state that the evolution of sleep is inevitable.
In simple terms?
Sleep is not something humans invented because we had spare time.
It is something biology protected because it matters.
We live in a mismatch world
So if sleep is this ancient and this essential, why are so many people struggling?
Because modern life is a mismatch.
Our bodies still run on ancient biological systems, but our lives are louder, brighter, busier and more pressured than ever. We have artificial light, constant notifications, late-night working, emotional overload, irregular routines and a culture that often praises pushing through.
Your biology has not failed.
Your biology is trying to work in a world it was not designed for.
Studies of hunter-gatherer communities, including the Hadza of Tanzania, the San of Namibia and the Tsimane of Bolivia, show insomnia rates of around 2%. In industrial societies, insomnia rates are reported at around 10 to 30%.
That is not because modern humans are weaker.
It is because the conditions around sleep have changed.
A 2025 meta-analysis estimated insomnia disorder prevalence at 12.4% in the general population, confirming that insomnia is not rare or niche.
This matters because sleep does not just affect the night.
It affects the whole life that follows it.
What poor sleep actually takes away
Most people already know what a bad night feels like.
You wake up and everything feels harder.
Your patience is thinner.Your motivation is lower.Your thinking feels slower.Your emotions feel closer to the surface.Tiny things feel bigger than they should.
That is not you being dramatic.
That is biology.
A contemporary review of sleep loss found that sleep is essential for attention, memory, executive function, emotional regulation and daytime performance. Sleep loss affects the way we think, feel and behave.
A scoping review on sleep deprivation and decision-making also found that sleep deprivation can impair decision-making, with important implications for roles where judgement, focus and emotional steadiness matter.
And that is the part we often miss.
Poor sleep does not just make you tired.
It changes how life feels.
It changes how you parent.How you work.How you make decisions.How you respond to stress.How you see yourself.How hopeful tomorrow feels.
This is why sleep matters so much.
Not because you need to be perfect.Not because every night needs to be flawless.But because sleep is the foundation your whole system keeps trying to return to.
Getting it back can be simpler than you think
You would have to be living under a rock not to know that poor sleep takes a lot away from you.
But what if getting it back is simpler than you think?
Not instant.Not magic.Not a hack.
But simpler.
Because sleep is not something you force.It is not a task to complete.It is not a performance you have to get right.
Sleep is something that happens when the body is ready.
And when you understand what is stopping your body from feeling ready, the fear starts to loosen.
For some people, the issue is low sleep pressure.For others, it is a delayed body clock.For others, it is stress, hyperarousal, hormonal change, pain, trauma, anxiety, or years of trying so hard to sleep that the bed itself has become a place of pressure.
This is why generic sleep tips often fail.
Because “avoid caffeine” does not tell you why you are wide awake at 3am.“Have a bedtime routine” does not fix a nervous system that feels unsafe.“Go to bed earlier” can make things worse if your body is not biologically ready for sleep.
You do not need more pressure.
You need to understand the system.
The most effective sleep support starts with biology
The gold standard treatment for chronic insomnia is Cognitive Behavioural Therapy for Insomnia, known as CBT-I.
The American College of Physicians recommends CBT-I as the initial treatment for adults with chronic insomnia disorder.
CBT-I is not just “sleep hygiene”. It looks at the factors that keep insomnia going, including sleep drive, sleep timing, thoughts about sleep, behaviours around sleep, and the conditioned fear that can build when sleep has been difficult for a long time.
This is the part I care about deeply.
Because when people understand why their sleep has broken down, they often stop blaming themselves.
They stop seeing themselves as broken.
They begin to see sleep as a biological process that can be supported again.
And that changes everything.
You are not broken
Clients often come to me convinced their sleep problem is genetic, permanent, or just the price of the life they are living.
They leave with something more valuable than a better night’s sleep.
They leave with understanding.
They leave feeling like themselves again.Clear-headed.Patient.Present.Like the volume on everything has been turned down a notch.
Not because the world changed.
Because they finally understand what has been happening in their body.
That is what this is really about.
Not just the night.
The whole life that depends on it.
Sleep is not optional.
It never was.
About Kerry Davies
Kerry Davies is a Sleep System Specialist and founder of The Sleep Fixer. With 27 years of experience, including 12 years in learning disabilities and mental health and 15 years in sleep, Kerry helps exhausted adults understand why their sleep has broken down and how to support it in a biology-first way.
Her approach is CBT-I informed, evidence-based, human-first and rooted in helping people rebuild trust in sleep.
Find out more at thesleepfixer.com
FAQ
Is sleep really essential for survival?
Yes. Sleep is a fundamental biological process involved in brain function, emotional regulation, memory, attention, physical repair and overall health. Sleep is not simply rest. It is active biological maintenance.
Why do so many people struggle with sleep now?
Many people struggle because modern life creates a mismatch with our biology. Artificial light, stress, irregular routines, screens, work pressure and nervous system arousal can all interfere with sleep pressure, circadian rhythm and the body’s ability to switch off.
Is insomnia caused by bad habits?
Not usually. Insomnia is often maintained by a mix of biology, stress, sleep timing, conditioned arousal and fear around sleep. Habits can play a role, but insomnia is not a character flaw or a lack of discipline.
What is the best treatment for chronic insomnia?
CBT-I, or Cognitive Behavioural Therapy for Insomnia, is recommended as the first-line treatment for chronic insomnia in adults. It works by addressing the patterns that keep insomnia going over time.
Can sleep improve once it has broken down?
Yes. Sleep can often improve when the right underlying pattern is identified. For some people this means rebuilding sleep pressure, stabilising wake time, reducing sleep-related anxiety, supporting the nervous system, or adjusting sleep timing.
References / further reading
Bar-Ilan University — Why do we sleep at all? The surprising answer from ancient animals
https://www.biu.ac.il/en/article/584180
Field & Bonsall — The evolution of sleep is inevitable in a periodic world
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0201615
Sleep function: an evolutionary perspective
https://pmc.ncbi.nlm.nih.gov/articles/PMC9670796/
The prevalence of insomnia disorder in the general population
https://pubmed.ncbi.nlm.nih.gov/40369835/
The role of sleep and the effects of sleep loss on cognitive, affective, and behavioural processes
https://pmc.ncbi.nlm.nih.gov/articles/PMC12168795/
Examining the effects of sleep deprivation on decision-making
https://pmc.ncbi.nlm.nih.gov/articles/PMC12189852/
American College of Physicians — CBT-I as initial treatment for chronic insomnia
https://www.acpjournals.org/doi/10.7326/M15-2175
ACP newsroom summary — CBT-I recommended as initial treatment
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