Oreo is right. Since it's impossible for the time to go from 7:30 to 7:20, you had at least one false awakening in there somewhere.

My FAs tend to be like that. They usually involve something associated with things I have to do first thing in the morning, like turn off my alarm, going to the bathroom, starting the shower etc. When I find I 'm doing something like that more than once in a given morning, I do a RC because it must be a FA.