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Life & fun · February 12, 2025

Sleep Calculator

Would you like to wake up feeling more energetic? Sleep Calculator will show you the best time to sleep or wake up for a refreshed start to your day.

Sleep Calculator launched on February 12, 2025 with 9 votes, #2,586 of 5,999 launches that month and more than 50% of that year's launches. The site was still online in September 2026, 1 year on.

Visit sleepcalculators.com ↗Sleep Calculator alternatives

What it does

If you go to bed at the right times, you’ll align with 90-minute sleep cycles. To feel fully rested, aim for 5–6 complete cycles. Sleeping in a dark room and letting natural sunlight wake you up can give you more energy in the morning. If you wake up in the middle of a sleep cycle, you might feel tired and groggy. However, if you wake up between cycles, you will likely feel more refreshed. Looking for the best time to wake up without feeling refreshed and energized? Our sleep calculator suggests ideal bedtimes and wake-up times based on 90-minute sleep cycles. We keep things simple, so you can rest well and greet the day with a clear mind. When you time your rest around complete sleep…from sleepcalculators.com

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