iPhone and Android
If Sleep Cycle can’t wake you up when you are in light sleep, it will be forced to wake you up at the end of the wake-up window.
Let's say you have set the alarm to wake you between 7:15 am and 7:45 am.
At 7:10 am, you are almost awake, but then slip into a new sleep cycle just before the start of your wake-up phase and thus you are in deep sleep at 7:35 am.
The app has to set off the alarm by 7:45, as that's the selected wake-up window. To avoid the alarm not going off at all, it will then have to wake you up when you are in deep sleep, because the wake-up window didn't time well with your current sleep cycle for that hour.
This can happen, and if this happens to you often, test another wake-up window, shorter or longer!
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