When you cannot sleep well: shift work, small children and broken nights

Sleep advice generally assumes an eight-hour opportunity, a consistent schedule and control over your evening. Shift workers, parents of small children, carers and people with insomnia have none of these, and being told to prioritise sleep is not actionable.

What follows is aimed at that situation.

Accept the constraint and adjust the training

The first and most useful adjustment is not to sleep but to the programme.

Chronic short or fragmented sleep reduces recovery capacity. Running a high-volume, high-intensity programme on four to six hours of broken sleep will produce accumulated fatigue, stalled progress and eventually an injury.

The right response is to reduce the training load to match the recovery available. Fewer hard sets, more moderate work, more frequent deloads, and a longer time horizon for progress.

This is not defeatist. A programme calibrated to your actual recovery produces steady progress; one calibrated to an idealised recovery produces a stall.

Protect total sleep even if quality is poor

When continuous sleep is impossible, total sleep time still matters. Get into bed earlier. Take the opportunity when it appears rather than staying up because it is your only quiet hour.

Fragmented sleep is worse than consolidated sleep of the same duration, and it is considerably better than less sleep.

Naps

Genuinely valuable in this situation and under-used.

A short nap of twenty to thirty minutes improves alertness and performance without much grogginess. A ninety-minute nap completes a full cycle and is more restorative when you are in real deficit.

For shift workers, a nap before a night shift has reasonable evidence for improving performance and alertness through it.

Nap earlier in the day where possible so it does not push back the main sleep period, and keep the environment dark and quiet.

Anchor sleep

For rotating shift patterns, a strategy with some support is to keep a consistent core period of sleep across all schedules — four hours at the same clock time every day, regardless of shift — with the remainder taken at variable times.

This provides some circadian stability rather than the complete disruption of a fully rotating pattern.

Light management

Light is the strongest signal for circadian timing, and controlling it is the most powerful tool available to a shift worker.

Bright light during your intended wake period, particularly at the start of it. For a night shift, bright light early in the shift.

Darkness during your intended sleep. Blackout blinds are essential for daytime sleep. Wearing sunglasses on the journey home after a night shift reduces the morning light exposure that tells your body to wake up.

These two measures do more than anything else available.

Caffeine, used deliberately

Caffeine is a legitimate tool for shift workers and it needs to be used with a clock rather than habitually.

Use it early in a shift and stop several hours before the intended sleep. Given a half-life of around five hours or more, a coffee at the end of a night shift will still be affecting sleep at midday.

Avoid using it to extend wakefulness into your sleep opportunity, which is the pattern that entrenches the problem.

Training timing around shifts

Train at a consistent time relative to your sleep rather than relative to the clock, where possible. Training immediately before your sleep period is generally a poor idea because of the arousal effect, though individual variation is large.

Accept that some sessions will be poor. A session at the end of a night shift is not going to be a personal best, and treating it as maintenance rather than progression is realistic.

For parents of small children

This phase is finite, which is worth remembering when progress stalls.

Reduce expectations deliberately rather than repeatedly failing to meet them. Two or three short sessions a week, maintaining strength rather than building it, is a completely legitimate plan for a year.

Shorter, more frequent sessions are easier to fit and easier to recover from than long ones.

And be careful about training as a stress outlet to the point where it becomes another stressor. Moderate training helps mood; maximal training on four hours of sleep does not.

The general principle

Training stress and life stress draw on the same recovery budget. When the budget shrinks, the sensible response is to spend less, not to spend the same amount and be surprised at the overdraft.

Consistency at a reduced level, sustained through a difficult period, beats intensity followed by injury or abandonment. Over years, this is what separates the people who are still training from the people who used to.