Sleep Calculator
Calculate optimal sleep and wake times based on sleep cycles
About Sleep Cycles
A complete sleep cycle lasts about 90 minutes. Waking up at the end of a cycle helps you feel more refreshed. Adults typically need 5-6 cycles (7.5-9 hours) per night.
Set your time and click Calculate
🌙Understanding Sleep Cycles
Sleep occurs in cycles of approximately 90 minutes, each consisting of different stages: light sleep (N1, N2), deep sleep (N3), and REM (Rapid Eye Movement) sleep. Waking up during light sleep at the end of a cycle helps you feel more refreshed and alert.
This calculator helps you plan your sleep schedule to wake up at the optimal point in your sleep cycle, reducing grogginess and improving your morning energy levels.
Sleep Stages Explained
Light Sleep (50-60%)
Transition stage where you can be easily awakened. Heart rate slows, body temperature drops.
Deep Sleep (15-25%)
Most restorative stage. Body repairs tissues, builds muscle, and strengthens immune system.
REM Sleep (20-25%)
Dream stage. Brain processes emotions and memories. Essential for learning and creativity.
Tips for Better Sleep
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