Alarm clocks

Lately I've had this thing where I dream my phone goes off or that there's a knock at the door or something. It makes me jump and I wake up, but then I look at my phone and there's nothing. It happens right at 6:00am or around then. It happened this morning and I think it happened yesterday. Sometimes if I tell myself I'll wake up at a specific time, I'll have that happen right when I said I'd wake up. It's great-I don't need an alarm clock! I'm crazy!!