Understanding / Info
I can't sleep — a guide to insomnia during cancer
A sleep routine, relaxation techniques, and when to ask for help. Insomnia is common and manageable.
General information, not medical advice
This guide offers general tips for managing insomnia. It does not replace medical consultation, diagnosis, or your personal treatment plan. Talk to your medical team for advice tailored to your situation.
Why does insomnia happen during cancer?
Common causes, and why you're not alone with this
Insomnia during cancer can happen for several reasons:
- Anxiety and fear — thoughts about the diagnosis, treatment, or the future
- Side effects — nausea, pain, night sweats, frequent need for the toilet
- Hormonal changes — some treatments affect melatonin and the sleep-wake cycle
- Changes to routine — medical appointments, hospital stays, breaks from work
- Physical discomfort — awkward positions because of scars, catheters, or pain
Important: Insomnia does not mean you are doing something wrong. It is a common reaction to physical and emotional stress. There are practical, safe solutions.
What you can do at home for better sleep
6 practical steps with no prescription needed
- 1.Set a consistent routine — the same bedtime and wake-up time every day, including weekends
- 2.Avoid screens (phone, TV, laptop) 1 hour before sleep — blue light disrupts melatonin
- 3.Keep the room cool (18-20°C) and dark — use blackout curtains or a sleep mask if needed
- 4.Limit coffee and sugar after 2:00 PM — they can affect sleep even 6-8 hours later
- 5.Try relaxation techniques before bed — guided breathing, meditation, calm music
- 6.If you don't fall asleep within 20 minutes, get up and do something quiet (reading, breathing) until you feel drowsy
Relaxation techniques for sleep
Free resources for calming down at night
When to talk to your doctor about insomnia
Signs that you need professional help
Contact your medical team if:
- The insomnia lasts more than 2 weeks in a row
- You often wake at night because of pain, nausea, or sweating
- The insomnia affects your ability to follow treatment (excessive tiredness, confusion)
- You have intrusive thoughts or intense fear that keep you from sleeping
- You have tried the sleep routine and relaxation techniques for 2 weeks with no improvement
Important: Don't wait until it becomes unbearable. Sleep is part of your care, not a luxury. Your doctor can assess and prescribe sleep aids suited to your situation (e.g. melatonin, antihistamines, or others) or adjust your cancer treatment if it is causing the insomnia.
What NOT to do
Avoid these common mistakes
Don't take sleeping pills without medical advice
Some sleeping pills can interact with chemotherapy, radiotherapy, or other cancer medicines. Always check with your doctor first.
Don't drink alcohol to fall asleep
Alcohol disrupts deep sleep cycles and can worsen treatment side effects (nausea, dehydration).
Don't force yourself to stay in bed if you can't fall asleep
If you haven't fallen asleep after 20 minutes, get up and do something quiet. Linking your bed with insomnia can make the problem worse.
Sources consulted
Medical and psychological resources for insomnia during cancer.
Medical information:
Relaxation techniques and sleep hygiene:
- Sleep Foundation — Sleep Hygiene
- “The Sleep Solution” by W. Chris Winter, MD — a practical guide to insomnia (book)
- “When Breath Becomes Air” by Paul Kalanithi — a memoir about sleep and fear in terminal illness (book, memoir/coping source)