Outside of devices used for sleep studies, sleep tracking is notoriously inaccurate in general. There is even a condition for people who develop insomnia from

Outside of devices used for sleep studies, sleep tracking is notoriously inaccurate in general. There is even a condition for people who develop insomnia from sleep tracker anxiety. It's called orthosomnia, and you can learn more about it here: https://www.sleepfoundation.org/orthosomnia https://www.sleepfoundation.org/orthosomnia I used to use AutoSleep religiously. It told you how much "sleep debt" you've accumulated. I've definitely lost sleep over worrying that I wouldn't "pay down" the debt (a useless endeavor, since sleep quality is something that's mostly out of your control once you're asleep). These days, I just use Apple's built-in sleep tracker, and I don't put too much stock into it.