UK Sleep Calculator
Evidence-based
Time it to your 90-minute sleep cycles
Based on about 90-minute sleep cycles plus 15 minutes to fall asleep, in line with UK sleep guidance for a healthy adult.
Tonight's plan
Lights off
Wake / alarm
Pick a time and tap calculate. You'll get bedtime options timed to the end of a full sleep cycle, so you wake up rested instead of mid-dream.
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