Ten free sleep tools.
Each is a pure calculation behind a 2-3 input form, with a transparent methodology and a named editor. No sign-up, no paywall — answer in seconds.
Try it now — no click-through
Your ideal bedtime, in 5 seconds.
Pick your wake-up time. We'll show the bedtimes that land you at a sleep-cycle boundary — so you wake up sharp, not mid-cycle and groggy.
I need to wake up at
Go to bed at one of these
More cycles = more rest — pick whichever fits your schedule. The 15 minutes it takes to fall asleep is already built in.
For your own sleep
Timing, stimulants, recovery — edited by Logan Foley, CSSC.
Sleep Cycle Calculator
When should I go to bed?
Open toolCaffeine Cutoff Calculator
When's my last coffee?
Open toolSleep Debt Calculator
How much sleep have I lost?
Open toolMelatonin Dose Calculator
How much melatonin, and when?
Open toolNap Optimizer
How long should I nap?
Open toolJet Lag Planner
How do I beat jet lag?
Open toolSleep Score Quiz — Free Sleep Test
How good is my sleep, really?
Open toolWhite Noise Generator
Which sound helps me sleep?
Open toolSleeping Position Finder
Which position suits my complaint?
Open toolFor babies & kids
Naps, wake windows and schedules — edited by Marie Hansen, PSC.
Try it now — no click-through
How long can your baby stay awake?
Tap your baby's age for the awake window, naps a day, and a typical bedtime — straight from the same data as our full wake-windows tool.
My baby is
A guide, not a rule — real babies vary ±15 min, and sleep cues (yawns, glassy stare) beat the clock.
Open the full wake windows tool