Sleep Cycle Calculator

Calculate the optimal bedtime or wake-up time based on 90-minute REM & NREM sleep cycles to avoid grogginess.

Sleep Target Mode

Target Wake-Up Time

Select your target wake or bedtime to discover the exact sleep windows that keep you refreshed.

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Circadian Health

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Calculate the best times to fall asleep or wake up aligned with natural 90-minute REM sleep cycles to prevent grogginess and wake up refreshed.

Optimized for 90-minute human sleep architecture cycles

Find wake-up times if going to bed now

Calculate bedtime based on planned wake-up alarm

Includes average 14-minute sleep latency buffer

Health & Wellness Knowledge Hub

Evidence-based nutrition guides, metric calculations, and strategy tips for Sleep Calculator.

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