Sleep Calculator
Free online sleep calculator — find the best bedtime or wake-up time based on 90-minute sleep cycles. Wake up refreshed and energized every morning.
Sleep tips for students
1
Keep a consistent sleep schedule — even on weekends.
2
Avoid screens at least 30 minutes before bed.
3
Keep your room cool, dark, and quiet for deeper rest.
4
Don't consume caffeine after 2 PM.
5
Aim for 5–6 complete sleep cycles (7.5–9 hours).
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