Calculators
Small tools for sleep and dreams. Each one answers straight away.
Sleep Cycle Calculator
A bedtime or wake-up time that lands at the end of a sleep cycle.
Open calculator
Sleep Quality Calculator
Eight questions and a sleep quality score out of 100.
Open calculator
How Much Sleep Do I Need?
A few questions, then one amount of sleep to aim for.
Open calculator
Sleep Debt Calculator
How many hours behind you are, from recent nights.
Open calculator
REM Sleep Calculator
About how much of a night was REM, and when the dream-rich stretch fell.
Open calculator
Nap Calculator
A short rest or one full cycle, from when you lie down or when you need to be up.
Open calculator
Dream Recall Calculator
A score for how often you remember dreams, and the one change that would move it.
Open calculator
Lucid Dream Readiness
A short quiz, a readiness band, and one practice to start.
Open calculator
Chronotype Calculator
Early, middle, or late sleeper, and a wake time that fits.
Open calculator
Caffeine Half-Life Calculator
How much caffeine is still in your system at bedtime.
Open calculator