This happened to me today! Most of the time it's usually after a night of drinking. Went to bed at 4am last night and woke up at around 8am this morning and couldn't fall asleep. Tried, gave up, then went to get a delicious iced coffee.
I always avoid checking the time when I wake up. I normally fade in and out of sleep for a couple of hours and end up getting up around 11. But I went to bed a 3:30, woke up, did my grumpy rolling around, and hopped up.
And it was 7:30. Pretty unsettling, honestly.
Yeah that's brutal. The sun also does not help. Probably why I woke up so early this morning. I have huge floor to ceiling windows and left the blind up last night, so the sun was beating right down on my face this morning. Not fun.
My curtains were open, come to think of it. That's probably why I thought it was so much later, since my room was much brighter than it normally is early in the morn.