Practice getting up in response to your alarm.

Seriously.

Once or twice a day, in the middle of the day, go lay down in bed, like you’re going to sleep, and set your alarm for maybe 5-10 minutes. The moment it goes off, shut it off and stand up. Teach your body the habit of standing up, immediately, in response to the alarm. So long as you’re getting enough sleep, you’ll start doing it in the morning, on reflex.