Ah sleep

Mystery of life that I am still trying to solve....

Why is it the best 10 minutes of sleep I get all night are the ones after the alarm has went off and I have hit snooze? Why can't I sleep like that the other 6 hours I am horizontal? Why does my body chose 6:30 and an annoying buzzing sound to decide it's finally ready to get into the rhythm?

And most important, why does this happen on days I have early morning meetings?????