Do the Popa method.
You set your alarm for the absolute latest time you can get up without being too late for whatever you do first in the morning. Then, you need to get up when it goes off, so you do.
You need to be careful to not set it too early.
Don’t set it for 20 minutes before you need to be at shachris, because on a lazy day you’ll say “I only really need 10 minutes”. If you only need 10 minutes, set it for 10 minutes.
Also, keep in mind that you may not need to be exactly on time for wherever you are going. If you are going to school and you can be 10 minutes late, set it so you will always be that late, because this way you absolutely cannot be any later.