Sleep Calculator
Calculate Your Best Sleep Cycle - Find optimal times to wake up or fall asleep
Sleep Facts
Sleep Cycles
Your sleep consists of 90-minute cycles, each with light, deep, and REM phases. Waking at the end of a cycle helps you feel refreshed.
Adults Need 7-9 Hours
Adults typically need 7-9 hours of sleep per night, which equals about 4-6 complete sleep cycles.
Blue Light Effect
Blue light from screens suppresses melatonin production. Avoid screens 1-2 hours before bedtime for better sleep quality.
Sleep Statistics
33%
of adults don't get enough sleep regularly
90
minutes is the average length of one sleep cycle
5-6
complete sleep cycles recommended per night
33%
improvement in cognitive performance with proper sleep