Its just a matter of priority. I get up at 5 for work Monday-Fri. I get up at 4:45 on Saturday to eat and get ready for my 6:30am ride. Its something I look forward to all week. Of course I'm tired and sometimes think it would be better if I just stayed in bed. I don't get to ride much if at all during the week, so come Saturday morning, I'm ready to jump out of bed. I'm also the kind of person that only needs 2-3 min to wake myself up even at my sleepiest of mornings.
And as mentioned above, its a sacrifice I take in order to ride every Saturday. I'm able to ride and get home just after the wife and kids have gotten dressed for the day. If I don't go this early, it takes away from family time.