PowerNap: Nap Timer & Alarm

Your lunch break ends at a fixed time. So the real question isn't "how long should I nap" — it's "by when should I lie down?"

PowerNap is a nap timer built around the watch on your wrist. It detects the moment you actually fall asleep from your heart rate and motion, learns your optimal nap length from how refreshed you feel afterwards, and works backwards from your fixed wake-up time to tell you when to lie down.

HOW IT WORKS

1. Set your wake-up time (e.g. 12:55)
2. Lie down by the suggested time and tap Start Nap on your watch
3. Heart rate + stillness detect real sleep onset — no tapping needed
4. Gentle haptics wake you right on time; rate how you feel in two taps After a few naps, the suggestions become personal.

MADE FOR YOUR WRIST

• Automatic sleep-onset detection from heart rate and motion
• Today's condition estimated from last night's sleep, deep sleep, resting heart rate and HRV
• Backup notifications on both watch and iPhone so you never oversleep

TRACK AND UNDERSTAND

• Every nap recorded automatically: time to fall asleep, actual sleep, heart-rate curve
• Nap score, weekly charts and start-time patterns
• Insights such as "naps close to the suggestion score higher"

POWERNAP PRO (ONE-TIME PURCHASE) Personalized learning, detailed analytics (heart-rate curves, charts, insights), the deep-sleep guard and wake-at-optimal are unlocked with a single one-time purchase. No subscriptions.

PRIVATE BY DESIGN Fully offline. All data stays on your devices. No ads, no tracking, no accounts.

• Requires a watch running watchOS 10 or later
• PowerNap is not a medical device. It does not medically determine sleep stages; estimates are based on heart rate and motion.