Health
What Time Should You Go to Bed?
Calculate your optimal bedtime or wake time based on 90-minute sleep cycles. Wake up feeling refreshed instead of groggy.
90-मिनट Cycles
Light sleep → Deep sleep → REM = ~90 min। Cycles के बीच उठना = fresh feel। Deep sleep में: grogginess। 6:30 AM उठने के लिए: 9:00 PM (6 cycles), 10:30 (5), 12:00 (4)।
कितनी नींद
Adults: 7-9 घंटे। Teenagers: 8-10। बच्चे: 9-11। 6 घंटे से कम regularly: heart disease और cognitive decline risk बढ़ता है।
⚡ CalcWolf Insight
A 2003 University of Pennsylvania study found that subjects sleeping 6 hours per night for two weeks showed cognitive impairment equivalent to staying awake for 48 hours straight — but they did not feel tired, demonstrating that humans are poor judges of their own sleep deprivation.
Frequently asked questions
6:30 के लिए कब सोएं?▾
6 cycles: 8:46 PM। 5: 10:16 PM। 4: 11:46 PM। +14 min सोने में लगने के लिए।
8 घंटे बाद भी थकान?▾
Deep sleep में alarm — 7.5 घंटे (5 cycles) often better than 8।
✓ Math logic verified against primary sources
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