It seems odd to be waking up regularly at 6am when one doesn't have to... and yet, that's what I've been doing all week. I suppose it's the light. It's certainly not the heat, which I was blaming at first - after our crazy weekend heat wave, weather has returned pretty much to normal spring: pleasantly warm during the day, chilly at night.
The temptation is to pull something over my head and go back to sleep, but I've been having such odd dreams it seems wiser to get up and start the day instead. At some point the bed late/rise early thing is going to catch up with me.