Tools

The spreadsheet, one sheet at a time. The sleep calculator is up; the rest are pencilled in and I will switch each one on when its numbers are checked.

Sleep calculator
Pick your wake time and get four bedtimes that land at the end of a sleep cycle, not the middle of one.
Sleep debt calculator
Add up the sleep you missed this week and see how many nights it takes to pay it back.
Nap calculator
Work out when to set the alarm so a nap ends before it turns into a groggy afternoon.
Caffeine cut-off calculator
Count back from bedtime with the caffeine half-life to find the time of your last coffee.
Online alarm clock
A plain alarm that runs in the browser tab, with a math problem to turn it off if you want one.
Kids sleep calculator
A bedtime window for a baby, toddler, child or teen, from the published hours by age with the day's naps taken off.