Sleepy — Sleep Cycles

APP INSIDE WORKS

Contains adsIn-app purchases

About this app

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.

Ratings and reviews

I've only been using the app for 2 nights, but both times resulted in me waking more alert than I have for the past month. Even when I would get an adequate amount of sleep, I'd be tired getting up, or lose my energy halfway through the day. With this app, I've been able to wake up energized + stay energized. It's very nice :)

I have to be up early as a barista. Having an alarm set to my sleep pattern was a game changer. This makes it easy! Edit: this has actually turned out to be my favorite sleep schedule tool ever. I've returned to it even after deleting once when I thought I found something better. Simple, easy to look at, EFFECTIVE. literally had this app for like 5 years..? A long time favorite.

I've been managing severe insomnia for a couple years. Now, I set a wake time that allows me to wake in a good mood (having completed a cycle) as opposed to being a zombie all day (being woken in deep sleep). The timing has improved my days, and makes limited amounts of time for sleep more productive. When I wake in the night, I can reset my alarm slightly to adjust for the interruption. Or, if I wake without enough time to complete a final cycle, I get up early without a zombie effect all day:)