Sleepy — Sleep Cycles

Wake up refreshed, not exhausted.

Sleepy is a science-based sleep calculator that helps you find the perfect time to fall asleep and wake up by aligning with your natural 90-minute sleep cycles. Stop guessing when to go to bed.

★ Calculate sleep times
Pick your wake-up hour or your bedtime, and Sleepy suggests the exact moments to sleep so you wake up between cycles — never in the middle of deep sleep.

★ Smart naps
Plan a power nap (20 min), recovery nap (30 min), or full-cycle nap (90 min). Sleepy recommends the right one based on the time of day and how close you are to bedtime.

★ Local sleep history
See your bedtime patterns, average duration, and consistency over time. All data stays on your device — nothing is uploaded.

★ Quick alarms
Tap a suggestion and Sleepy hands it to your clock app, ready to ring.

★ Sleep science you can read
A built-in Learn section explains chronotypes, sleep stages, and what really happens while you sleep — backed by research from Walker, Mednick, and the National Sleep Foundation.

✓ Privacy-first: your sleep data never leaves your device.
✓ No account required.
✓ Free, with an optional one-time purchase to remove ads.
✓ Designed for Material You, dark mode, and 5 languages.

Sleepy is your nightly companion for better rest, made for people who care about how they feel tomorrow.