Waking Up Early vs Waking Up Late

Waking up early has it's benefits. While everyone else is still sleeping I have some free time to relax and read on the web. Seems strange because a year ago I would fall asleep around the same time I now wake up each day. Waking up late feels like I miss a big part of the day. Not sure what changed, must be age. Also too, years ago I could easily pull an all-nighter with no problem. I can't do that anymore. But, on the same token, I don't need much sleep. I seem to function fine with 5 hours.