Have been experimenting with alarmless sleep schedule.
1) made me to try sleeping earlier because I know I won't be able to wake up early if I sleep late.
2) alarm lies to us saying "you can sleep anytime you want, don't worry, I'll wake you up, just watch couple more videos"
3) the more alarms/reminders/calendar events you have the less conscious your brain becomes, it stops caring about future events.
4) if I ever set alarm, i wake up ~30 minutes before it goes off