What are reasons for waking at the same time nightly or every other night?!

What are reasons for waking at the same time nightly or every other night?

I have been having an odd thing happen lately. I go to bed between 12am and 1am but I have been waking up at 4:47am on the dot. Sometimes it is two nights in a row and sometimes it every other night. It has happened about 4 times and when I wake up I am not groggy feeling like I am waking up it feels like I havent been sleeping. I wake up look at the clock and go back to sleep. I am just curious what others might think this is, I am open to all kinds of answers, spiritual, medical etc.

4 weeks ago
Well these all sound good it just started happening and I get up 3 hrs later to an alarm. Oh to the person who doesn't pay attention, I never said it happened twice in the same night. It has happened 4 nights total sometimes two nights in a row and sometimes skipping a night.

4 weeks ago
Let me also add this just started this week and I have no known health problems and I am 24.

Our bodies have circadian rhythms. Perhaps you have a circadian rhythm sleeping disorder?