There's a way to mess with you that only your own brain is capable of.
Today, I was supposed to get to work at 8h30 and I normally set up the alarm 10 minutes before I have to clock in. Anyway, I woke up, barely keeping my eyes open and I started dressing up. Then I stopped, realising that I didn't hear the alarm. I picked up the phone - 6h25. I went back to bed. I woke up again, and started to get dressed, absolutely convinced I was late. I stopped after some seconds, because, again, there was no alarm. I checked - 7h35. The alarm went off eventually, I turned it off and I closed my eyes. It seemed only seconds, and when I went to pick up the phone again and it was 8h46.... my brain just loves me.