For reasons I cannot possibly comprehend, I keep on waking up at 8:10am.

I can go to bed at four in the morning - I'll wake up at 8:10am.
I can have an early night at ten, and still wake up at 8:10am.

Without fail, I look over at my clock - and that's what it'll say....

...except when I go to work at the weekend. Ironically, when I'm supposed to get up at 8:10am, I'll probably oversleep.

I can't figure this out at all. It's exceptionally annoying.