Look for the reasons behind your sleep, in your own records.

Logging takes one tap

Coffee, alcohol, exercise, a bath, phone in bed, a late dinner, stress and naps. Just tap a tile to log it, and you have 5 seconds to undo. You can also log from Home Screen widgets, Control Center, the Lock Screen, Shortcuts and Siri. Workouts, caffeine, alcoholic beverages and mindful minutes from the Health app come in automatically.

Compare days with a factor and days without

For each factor, Nemuri shows the difference in time asleep, deep sleep, bedtime and morning mood. Each night appears as a dot, together with the average and the 95% range, and a separate weekday and weekend check shows whether the pattern holds for both.

Screens show sample data.

Sleep debt and tonight's bedtime

Nemuri calculates your sleep debt over the last 14 nights and the gap between your weekday and weekend sleep timing (social jet lag), then works back from your planned wake-up time to suggest a time like “Get into bed at 11:00 PM tonight.” The calculation is shown line by line, and tonight's bedtime can also appear on widgets and the Lock Screen.

Times, dates and numbers follow your region's format, including 12-hour or 24-hour time.

Try it yourself and see

Change a habit, like no coffee after 2:00 PM for two weeks, and compare those nights with the same number of nights before. Nights when you stuck to it are detected from your records automatically.

Look back on a week of sleep and habits

See your average time asleep, bedtime and wake-up time with the change from last week, your time asleep for each night, and how many nights had each factor. From 9:00 PM to 6:00 AM, the screens stay dark, so they aren't too bright when you open the app at night.