Sleep diary guides

• How to keep a sleep diaryWhat to write down each morning, for how long, and the mistakes that make a diary less useful.
• Sleep efficiency: what it is and why 85% mattersThe share of your time in bed spent asleep, how it's worked out, and why 85% comes up so often.
• Keeping a sleep diary for CBT-IWhy cognitive behavioural therapy for insomnia runs on a diary, and how to keep one your therapist can use.
• Seeing a doctor about sleep: what to takeWhen to see a GP about insomnia, and what to bring so the appointment gets somewhere.
• Caffeine, alcohol and sleepWhat the research says about late coffee and an evening drink, and how to test it on your own nights.
• Sleep diary or sleep tracker?What a diary records that a watch or ring can't, and where a tracker helps.

These guides aren't medical advice. If poor sleep has gone on for months or makes the day hard to cope with, see your doctor.