Sleep Time Calculator

Find Your Perfect Sleep Schedule

Calculate Sleep Times

❓ Frequently Asked Questions

What's the best time to go to bed if I wake at 6am?

Our sleep cycle calculator recommends these optimal bedtimes for a 6am wake-up: 9:45pm (5 cycles), 11:15pm (4 cycles), or 12:45am (3 cycles), accounting for 15 minutes to fall asleep.

How does this calculator help with deep sleep?

This sleep cycle calculator for deep sleep times your wake-up to occur between cycles, when you're in lighter sleep phases - helping you avoid grogginess and feel more refreshed.

How much sleep do I actually need?

Our how much sleep do I need calculator suggests 5-6 complete 90-minute cycles (7.5-9 hours) for most adults, with options to see what works best for your body.

What makes this a wake up refreshed time calculator?

Unlike basic alarms, this wake up refreshed time calculator uses sleep science to avoid interrupting deep sleep stages - the key to morning alertness.

What's considered a perfect sleep schedule for adults?

A perfect sleep schedule for adults maintains consistent bed/wake times aligned with natural circadian rhythms. Our calculator helps establish this by finding your ideal cycle-based timing.

How does the 90 minute sleep cycle alarm calculator work?

This 90 minute sleep cycle alarm calculator counts backward from your desired wake time in 90-minute increments (plus your fall-asleep time) to identify optimal bedtime windows.

Why do I sometimes feel tired after 8 hours of sleep?

You're likely waking mid-cycle. Our calculator prevents this by aligning your schedule to complete full sleep cycles - typically 5 cycles (7.5hrs) or 6 cycles (9hrs).