The body is tired, the mind won't stop, and the hours pass — usually not from a lack of sleepiness, but because the day's arousal had nowhere to discharge.
Rule out medically, first
Before any psychological explanation: persistent insomnia has frequent and treatable medical causes. Hyperthyroidism produces difficulty falling asleep; restless legs syndrome, often tied to iron deficiency, shows up exactly at bedtime; sleep apnoea produces daytime exhaustion that gets mistaken for insomnia; chronic pain, acid reflux and needing to urinate at night fragment sleep. Many medicines do the same — corticosteroids, some antidepressants, beta-blockers, decongestants and pseudoephedrine preparations. If insomnia lasts more than a month, seeing a GP and running bloods including ferritin and TSH is a reasonable first step.
What is actually happening
Sleep is not a switch but the result of two processes that have to line up: sleep pressure, which builds with every waking hour, and the circadian rhythm, which tells the body when it is night. Onset insomnia usually appears when a third factor — arousal — is too high to let the first two work.
What keeps arousal up: problems left to solve, a screen with light and stimulating content, the four o'clock coffee (caffeine has a half-life of about five to six hours, so half is still in the body at nine in the evening), and alcohol, which helps you fall asleep and fragments the second half of the night.
On top of all this sits a specific mechanism: sleep performance anxiety. After a few bad nights the bed becomes the place where you struggle. The body learns the association, and simply entering the bedroom produces arousal. Hence the familiar paradox: you fall asleep on the sofa and wake fully on moving to bed.
What it could be
Several possibilities, because this list is not a diagnosis. What separates them is in the detail below each.
Sleep hygiene and caffeine
How to tell
Bedtimes vary by more than an hour between days, the screen is in bed, or coffee comes after two o'clock. Recognisable because on holiday, with a regular schedule, the problem disappears with nothing else changed.
Anxiety and a mind that won't stop
How to tell
Bedtime is when every worry arrives, because it is the first hour without distraction. The thoughts look forward — tomorrow, next month — and circle without reaching a decision.
Conditioned insomnia
How to tell
It started with a clear cause — a stressful period, a small child — which resolved long ago, but the insomnia stayed. You fall asleep easily anywhere other than your own bed.
A shifted circadian rhythm
How to tell
You can't fall asleep at eleven but sleep perfectly from two, and would wake naturally at ten. Not insomnia proper but a shifted internal clock — and it is treated differently, with morning light rather than sleeping pills.
Depression
How to tell
Sleep is only one symptom. It comes with loss of pleasure, no energy in the morning and, typically, very early waking with no way back to sleep.
What helps now
The best-evidenced intervention is not a drug but cognitive behavioural therapy for insomnia (CBT-I), recommended as first line by European and American guidelines, with effects that persist after it ends — unlike sleeping pills.
What you can do now, from the same logic:
Get out of bed after twenty minutes. Counterintuitive but central: the bed must stay associated with sleep, not with struggle. Do something boring in dim light and return when sleepiness arrives.
Wake time is the anchor, not bedtime. Waking at the same hour, weekends included, rebuilds sleep pressure. Lying in destroys it.
Empty the mind onto paper beforehand. Ten minutes writing what needs solving and the first step for each. The mind insists on whatever it thinks will be lost.
Light in the morning, dark in the evening. Ten to fifteen minutes of daylight in the first hour after waking does more for the rhythm than any evening ritual.
Give up catching up. Afternoon naps and early nights after a bad one feel logical and undercut precisely the pressure you need the following night.
When to get help
Book an assessment if the insomnia has lasted more than a month, if it affects your work or your safety driving, if a partner has noticed pauses in your breathing or loud snoring, or if it comes with low mood and loss of pleasure. **If thoughts of not wanting to live appear, call 112 — now, not after an appointment.**
This page is informational and is not a diagnosis. It does not replace a medical or psychological assessment. If you are in immediate danger, call 112.
Not sure which it is?
That's fine — you shouldn't be, from a page. A 15-minute call is the simplest way to find out what comes next.