Free Sleep Tool

😴 Sleep Calculator 2026 — Best Bedtime & Wake-Up Times

Wake up feeling refreshed — every time. Our sleep calculator uses 90-minute sleep cycle science to find your perfect bedtime or wake-up time.

Calculate Your Sleep Schedule

⏰ Wake-up Time

We will calculate the best times to fall asleep tonight.

Why Sleep Cycles Matter

Your sleep is divided into repeating 90-minute cycles, each consisting of light sleep, deep sleep (slow-wave sleep), and REM sleep. Waking up mid-cycle — even after 8 hours — leaves you feeling groggy. Waking at the end of a complete cycle feels natural and refreshed.

🌙

Light Sleep (N1 & N2)

Transition phase. Heart rate slows, body temperature drops. Easily awakened.

💤

Deep Sleep (N3)

Physical restoration. Growth hormone release, immune repair, memory consolidation.

🌀

REM Sleep

Mental restoration. Dreaming, emotional processing, learning consolidation.