Why am I tired but can't fall asleep?

This 'tired but wired' feeling usually reflects hyperarousal: your body is tired but your nervous system, often with raised cortisol, is still switched on. It is common during stress and hormonal shifts.

How do I calm a racing mind at night?

Winding down earlier, getting off screens, keeping caffeine and alcohol away from the evening, and a consistent wind-down routine all help. If it persists, CBT-I is the recommended treatment.

Is 'tired but wired' a sleep disorder?

It is a common feature of insomnia rather than a separate disorder. If it is frequent and affecting your life, it is worth seeing a doctor, who may recommend CBT-I.

Sleep

Why can't I fall asleep even when I'm exhausted?

Quick answer

Lying awake bone-tired with your mind racing is one of the most frustrating sleep problems, and it has a name: hyperarousal, often described as 'tired but wired'. Your body is exhausted, but your nervous system is still switched on, usually with stress hormones like cortisol running higher than they should at night. It is common during stressful spells, around hormonal shifts, and when your days and evenings keep the brain in high gear. The upside is that it tends to follow triggers you can track and change.

What might be happening

Sleep needs two things: enough sleep pressure (tiredness) and a calm-enough nervous system to let go. Exhaustion gives you the first, but if you are in a state of hyperarousal, the second is missing. Under ongoing stress, cortisol and the fight-or-flight system stay active into the evening, so the brain keeps scanning and planning even as your body begs for rest.

Screens and work late into the evening, caffeine and alcohol, and worry about not sleeping all feed the wired feeling. Hormonal changes across the cycle and in perimenopause can add to it. The pattern is often clearest in the hour before bed, and in what the day looked like, rather than in the bed itself.

What to notice

What your evening looked like: work, screens, exercise timing, big conversations
Caffeine and alcohol, and how late you had them
Whether your mind is racing or your body feels physically restless
Stress levels that day, and where you are in your cycle
What helps you wind down, and what makes it worse

Track the two or three hours before bed, not just the night itself. Hyperarousal is usually built during the evening, so that is where the pattern (and the fix) tends to show up.

Related patterns

Women who feel tired but wired often also track evening anxiety, a racing mind, cycle-linked sleep changes and 3am waking.

When to get support

If you regularly cannot fall asleep despite being exhausted, and it is affecting your days, talk to a doctor and ask about cognitive behavioural therapy for insomnia (CBT-I), the recommended first-line treatment. Seek support sooner if sleep loss is paired with low mood or persistent anxiety.