Occasionally because it can't be done at night (needs daylight, must happen during business hours, etc.) Or because they were doing someting else the night before.Why not stay up late the night before instead? Don't kid yourself and go against your circadian rhythm, work with it and be productive
For the ones I've known best (college students at the time) I think it was chronic sleep deprivation. They stayed up late socializing or studying, then had to get up again the next morning for an early class, then stayed up late again, repeated all week long. By the time a weekend came, they were so tired they could sleep all day if nothing forced them to wake up.Ya I don't get it either.
Ya someone might want to get up early for whatever reason but even if it's an unrealistic early..... 4 hours? That's a half a nights sleep. How could one sleep another 4 hours past when the thought they'd get up. Just not wrapping my head around this one.
(I've got a different problem with my alarm: I set it for the last possible minute so I have to jump up and get going. But sometimes I wake up before the alarm, get up, and forget to turn it off. Then it's beeping away until me or someone else walks back into the bedroom to turn it off. Not really an improvement over the people who keep hitting snooze, just a different thought process leading up to the problem.)
