How do I calculate sleep efficiency?

Sleep efficiency from one night of a sleep diary, as used in CBT for insomnia. The calculator on this page does it free, without an account, and shows the assumptions behind the answer.

Tool

Sleep efficiency

Sleep efficiency from one night of a sleep diary, as used in CBT for insomnia.

Got into bed (24-hour time)

Got out of bed

Minutes to fall asleep

Minutes awake during the night

Minutes awake in bed before getting up

Nothing you enter is stored or sent anywhere. The calculation runs for this request and is then gone.

Before you use this

Fill in the form and the result appears here, along with every intermediate value and a note on what the number does not mean.

These calculators run on the server with a plain form post, so they work with JavaScript disabled and nothing is sent to a third party.

More health tools

All tools