Phase Alarm is an alarm clock app for people who don't get up at the same exact time every day.
It allows you to take advantage of multiples of 1.5 h (which is typically one sleep phase) without having to count minutes before sleep. Or using phase detection that doesn't always work well enough.
You can specify the sleep length you need to wake up feeling refreshed, and then on top of that add a couple of minutes it usually takes for you to fall asleep. Keep in mind that multiples of 1.5 h are what usually works! The app is not going to stop you from ruining your life with 4 hour sleep cycles, though.
There are 3 alarms that are set to these default values:
0 h + 25 min (for a power nap)
6 h + 7 min (for 4 sleep phases and 7 minutes of additional time needed for falling asleep)
7.5 h + 7 min (for 6 sleep phases and 7 minutes of additional time)
You can customize them all in the settings (as well as the vibration type).
The creature’s name is Zwk.
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