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Sleep Calculator

Find the optimal times to sleep based on sleep cycles

What time do you need to wake up?

📚 About Sleep Cycles

A complete sleep cycle lasts approximately 1.5 hours and includes:

Light Sleep (Stage 1-2): Body relaxes and prepares for deep sleep
Deep Sleep (Stage 3): Most restorative, tissue repair, immune function
REM Sleep (Stage 4): Brain active, memory consolidation, dreaming

Waking up between cycles helps you feel more refreshed than waking during deep sleep.