Acute insomnia after stress

Why insomnia after an event is normal

The human arousal system is designed to raise activation in the face of threat or major change. An exam, an illness, a loss, a change of job all trigger it. In that context, sleeping badly is the response of a system working correctly.

Most cases resolve within days to weeks once the situation settles. What decides whether it becomes chronic usually lies in what people do during this very period.

Three things NOT to do

1. Do not go to bed earlier and do not lie in. This is the most natural response and the most damaging. Time lying awake in bed builds no sleep pressure, and it teaches the brain that the bed is a place of wakefulness.
2. Do not nap during the day. A long daytime sleep spends sleep pressure meant for the night, so it buys an easier afternoon at the cost of a harder night.
3. Do not start taking something every night. Using something for a few nights during an acute episode can be reasonable and is a doctor's decision. The problem is when it becomes a nightly habit before you notice.

Three things to do

1. Keep a fixed wake time, even after a bad night. This is the single most effective thing. The wake time anchors the body clock; leave the bedtime to the body.
2. Leave the bed if you cannot sleep. Go to another room, do something undemanding in dim light, and return only when you are genuinely sleepy.
3. Keep your daytime activity as it was. Cancelling things for fear of tiredness lowers sleep pressure and lowers mood.

Why the natural response backfires

This deserves explaining carefully because it runs entirely against intuition. After a sleepless night the body sends a very clear signal: lie there longer, rest more. Following that signal is the most reasonable thing in the world, and it is precisely how a short-term episode turns into a chronic one.

The mechanism is sleep pressure. Sleep pressure builds with the hours you are AWAKE, and sleep discharges it. Every extra hour in bed or napped during the day is an hour not building pressure for the next night. The result: the next night is harder again, so you lie there longer again, and the loop reinforces itself.

When to be seen

• It has lasted more than two weeks and is affecting your days.
• You notice yourself starting to worry about sleeping. This is an early sign of the maintaining mechanism.
• You have started taking something to sleep nearly every night.
• There is low mood or anxiety alongside it.
• The trigger has passed but sleep has not returned.

Intervening at this stage usually needs only two behavioural changes and a few weeks, rather than a full course. That is the most practical reason not to wait.