Apps like Polyphasic Sleep

Here are some great alternatives to Polyphasic Sleep by Alexey Kuzovkov :
Sleep Calculator
Sleep Calculator
★4.1
Wake Up Well
Wake Up Well
★3.7
Sleep Hours Alarm
Sleep Hours Alarm
★3.8
Bedtime
Bedtime
★4.4
Sleepytime
Sleepytime
★4.6
sleep²
sleep²
★3.3
Sleep Tracker - Sleep Recorder
Sleep Tracker - Sleep Recorder
★4.6
Sleep Monitor: Sleep Tracker
Sleep Monitor: Sleep Tracker
★4.4
Sleep Cycle: Sleep Tracker
Sleep Cycle: Sleep Tracker
★4.3
Sleepio
Sleepio
★4.3
Pokémon Sleep
Pokémon Sleep
★4.3
Sleepy Time
Sleepy Time
★3.8
Guided Meditation For Sleep
Guided Meditation For Sleep
★3.6
SleepMaster - Sleep Monitor
SleepMaster - Sleep Monitor
★4.5
Sleep Easy
Sleep Easy
★3.4
Good Night's Sleep Alarm
Good Night's Sleep Alarm
★3.9