I've been sleeping badly on and off for about a month now so I don't consistently wake up and I often am only half awake at 5am which is why I don't take it then. I get up at 6.30am every week day so if I sleep properly thats my consistent waking time. At 5am I just roll over and pretend I am still asleep to get that additional body rest...
I also can't think about temping at that time of the morning, I am sure it would wake me up fully and then I'll miss the resty snooze

Sarah - thanks for the reminder on 1/2hr either side.