To preface, I hate being awake and I almost never get as much sleep as I want.
And my sleep schedule entirely hinges on how I fall asleep. If I take my sleeping pills I usually manage to get a good 8 hours but I feel groggy in the morning. If I don't take anything I'll toss and turn in the bed half-asleep literally feeling my heart bursting through my chest while my anxiety eats me alive until I collapse at around 4 AM. If I pass out drunk I usually don't get more than 4-5 hours, but I do manage to fall asleep again later in the morning.
And if I get a nightmare at any point during the night I can just give up on sleeping for the day and make some coffee and try to do something whit the hours of blissful awareness I've been regaled with.