I'm assuming Merry did what I did this morning:
I knew I had to be two towns over at 9:00 so I set my alarm for 7:30 to give myself time to wake up. I woke up on my own and stared at the clock that said 8:30 and jumped out of bed, realizing I'd forgotten to set my alarm. Grabbing clothes, getting downstairs, and realizing that being dead late allows for immediate waking up, I noted that the clock said... 7:30. I'd set my bedroom clock wrong (whoops). But the point is, I meant to get up at 7:30 and I woke up at 7:30. Without the aid of an alarm that never would have gone off because I pushed the wrong button.
See? My story proves that you don't need an alarm clock to get up on time, if you have sufficient motivation to be out of bed.
