You can do CBT-I at home. Self-guided delivery is recognized in the European insomnia guideline as a first-line option, and it has been tested in large trials. What makes it work is doing the steps in the right order and sticking with them through the weeks where it feels worse - not finding a shortcut.
This is the sequence, what each part is for, and the safety rules that come first.
Before you start: the safety check
Sleep restriction, the most powerful part of CBT-I, increases daytime sleepiness before it improves sleep. That has been measured directly, including objectively impaired vigilance during the restriction phase.
So do this with a clinician rather than on your own if:
- you drive for a living, operate machinery, or do any work where sleepiness is dangerous;
- you snore loudly, wake gasping, or have been told you stop breathing in your sleep - possible sleep apnea needs ruling out first;
- you have severe depression, or any thoughts of harming yourself;
- you have a medical condition where sleep loss carries particular risk;
- you are taking sleep medication and want to change it - that is your prescriber's call.
If none of those apply, here is the order.
The steps, in order
Step 1: Keep a sleep diary (weeks 1–2)
For one to two weeks, change nothing. Each morning, write down when you went to bed, roughly how long it took to fall asleep, how long you were awake in the night, when you finally woke, and when you got up.
This is the baseline every later decision is made from. Your memory of a bad night is not reliable enough; the diary is. How to keep one properly.
Step 2: Fix your rising time
Pick a wake-up time you can keep every single day, weekends included, and keep it regardless of how the night went. This anchors your body clock and is the fixed point the sleep window is built backwards from.
Step 3: Set your sleep window
From the diary, work out your average total sleep time. That becomes your time in bed - counting back from your fixed rising time - with a floor you do not go below regardless of what the diary shows. The arithmetic, written out.
