Galarm - Social alarm clock and reminders
NapBot - NapBot is Machine Learning powered sleep tracker for your Apple Watch.
Alarmy - World's most annoying alarm app
Rise: Track Sleep & Circadian - Wake up & fall asleep better
Alarm Clock Xtreme - Alarm Clock Xtreme: Alarm, Stopwatch, Timer (Free) is the most popular alarm clock app created and published by AVG Labs for both iOS and Android devices.
Withings Sleep - A sleep tracking mat by Withings