The fact of my alarm wakes me up

This isn't really about dreaming; this is just an interesting phenomenon I've observed during the nights I try to WBTB for WILDing. If I set my alarm for, say, 5:30, I'll wake up automatically around 5:20 without fail and have to turn my alarm off. This happened for so many days that I thought I could keep my alarm off, wake up by myself in the night, and not have to grope around in the dark and get blinded by my phone's screen. But when I didn't set an alarm at all, I just slept through the night. Does anyone else experience this? It's a little frustrating since fumbling with my alarm wakes me up more than I want for WBTB.

I do the same thing actually. I think it's because you're anticipating/thinking about the upcoming events of the next day and when you're sleep is almost over your body wakes you up early.

Though I have been waking up at 3:00-3:30 every night for the past month or two.
(ooh the devils hour. scary!)