Sleep Cycle Calculator

Find the best bedtime or wake time based on 90-min sleep cycles.

Wake up at

Mode

Cycle length (min)

Time to fall asleep (min)

Best bedtimes to wake refreshed

06:10 AM9 hrs sleep · 6 cycles
07:40 AM7.5 hrs sleep · 5 cycles
09:10 AM6 hrs sleep · 4 cycles
10:40 AM4.5 hrs sleep · 3 cycles
12:10 PM3 hrs sleep · 2 cycles
01:40 PM1.5 hrs sleep · 1 cycle

Sleep cycles are ~90 min on average. Waking at the end of a cycle (light sleep) leaves you refreshed; waking mid-cycle (deep sleep) leaves you groggy.

Acerca de esta herramienta

Enter when you need to wake up, get 4 suggested bedtimes. Or enter a bedtime and get wake-up options that end on a cycle.

Herramientas relacionadas

Más salud & fitness que podrían resultarte útiles.

Caffeine Half-Life Calculator

Find out how much caffeine is still in your system at bedtime.

Sleep Debt Calculator

See how much sleep debt you've accumulated and when you'll recover.

Wind Chill Calculator

Compute the felt-air temperature from wind speed and air temperature.

Otras categorías

¿Buscas algo diferente? Explora el resto del catálogo.

Sugerencias patrocinadas

Like this site? You'll love our weekly newsletter
One new tool, one fresh Reddit pain point, every Friday. No spam.

Algunos enlaces a continuación son enlaces de afiliado. Podemos ganar una comisión si compras a través de ellos, sin coste adicional para ti.

Sugerir herramienta