If you need more stick than carrot to get you out of bed in the morning, the puzzle alarm clock's a good option. You get an array of challenges to choose from which will force you to wake up and think, or the alarm will continue to pester you until you get up.

This app features great Material Design UI.

Prompting you when you come within 8 hours of the time you should be getting up, to ensure you get a full night's sleep.