Sleeping better after cancer treatment

Broken sleep after cancer is not simply a habit to be corrected. It usually has real drivers — hormonal changes, night sweats, pain, anxiety, disrupted routine, medication — and the effective approach is to address those alongside the sleep pattern itself. Sleeping tablets can be useful briefly, but they lose effectiveness and are not a plan for months.

• Treatment-induced menopause or hormone therapy — night sweats and hot flushes wake people repeatedly, often without them realising why.
• Anxiety and hypervigilance — three in the morning is when fear of recurrence is loudest.
• Steroids given with chemotherapy disrupt sleep for days and the pattern outlives the drug.
• Pain, neuropathy and restless legs — nerve pain characteristically worsens at night.
• Daytime napping and lost routine — months of illness erode the cues that set the body clock.
• Needing the toilet at night, common after pelvic surgery, radiotherapy or prostate treatment.
• Sleep apnoea, more likely with weight gain, and a frequent hidden cause of unrefreshing sleep.

Cognitive behavioural therapy for insomnia is a short, structured programme — typically four to eight sessions, available in person, in groups, and through well-validated digital programmes. It is recommended ahead of medication in clinical guidance, including for people after cancer, and its effects last after the programme ends.

Its core components are uncomfortable for the first two weeks and then work:

1. Fixed wake time, seven days a week, regardless of how the night went. This is the anchor for everything else.
2. Sleep restriction — temporarily limiting time in bed to roughly the time actually spent asleep, then extending as sleep consolidates. Do this with guidance, not alone.
3. Stimulus control — bed is for sleep and sex only. If you are awake for more than about twenty minutes, get up, go somewhere dim and quiet, and return when sleepy.
4. Managing the thoughts — a written worry list earlier in the evening, and letting go of trying to sleep, which is itself arousing.
5. Winding down — a genuine buffer between the day and bed, without screens delivering news or email.

Short courses can be reasonable at particular moments — the week of a scan, a crisis, an acute phase of treatment. The problems are tolerance, dependence, next-day grogginess, falls in older people, and the fact that stopping usually returns you to where you started. If you have been taking them for months, ask for a plan that includes CBT-I rather than stopping abruptly.

Alcohol is not a sleep aid. It shortens the time to fall asleep and then fragments the second half of the night, reliably increasing next-day anxiety and fatigue.