Alarm clock - Self Reminder is an Android app that can remind you to wake up, or set an alarm. It can also set reminders for tasks to complete throughout the day. This is a free app, and you can download it on your phone or tablet.

It can remind you to wake up at a specific time, which is good if you need to be reminded to go to bed at a specific time.

It has a snooze button, which is good if you need to snooze for a little while longer. It also has a countdown timer before you go back to sleep.