I seldom get back up, or give up on the attempt even if I end up just laying there till the alarm goes off. I have been tracking my sleep hours with an app for awhile. Based on the previous nights sleep, my mood, and how tired I feel I will stay up waiting to feel tired and if it doesn't happen then I will take something to make me sleepy in time to get 4-5 hours before I need to be up. If I had little sleep the night before, I'll knock myself out earlier to get 5-6 hours. This is how I manage it now.

I used to just sleep when I could and stay up if I wasn't sleepy. Very bad results for me!