If RISE shows more sleep debt than another app or wearable, it's likely because of differences in how each one calculates sleep debt. There are four main reasons the numbers may not match:
- Different sleep need estimates. RISE may estimate a higher personal sleep need than other apps, which means more sleep debt if you're not meeting that need.
- Different debt windows. RISE calculates sleep debt over a rolling 14-night window. Other apps may use a shorter window — like 7 nights — or only track last night's deficit. A longer window captures more accumulated sleep loss.
- Different weighting. RISE weights recent nights more heavily than older ones. Other apps may treat every night equally or use a different weighting approach. This changes how the same sleep history adds up.
- Different ways of measuring sleep. Some apps measure total time in bed, including periods when you were lying awake. RISE subtracts detected awake time, counting only the time it estimates you were actually asleep. This can mean RISE records fewer hours of sleep per night than another app does, widening the gap between your sleep need and how much you actually slept — which means more sleep debt.
For many people, the RISE sleep debt number feels high at first because most of us carry more sleep debt than we realize. As you work to lower your sleep debt, you'll be able to assess whether the number matches how you feel and perform day to day.
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