The best alternatives to sleep3 are Bonjour, Walk Me Up, and Wakie for iOS. If these 3 options don't work for you, we've listed a few more alternatives below.
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Smart alarm clock + Bedtime reminder that wakes you in the lightest sleep cycle using Apple Watch. Using Haptics to wake you so that it is gentle on you and it does not disturb your partner.
Move Alarm Clock - Best Alarm to Wake Up with Music. It is your best Alarm Clock to Wake Up with your favorite Music. Set Multiple Alarms, know Live Weather Updates for your Location, Built-in Flash Light for night supervision, Smart Way to Stop/Snooze Alarm by Moving Alarm Clock Up/Down.