Lights on or off...

As I said before, me & my roomate's times for waking up conflict. I had my 8:00 am class today, so when I woke up & turned on the lights on she started moving around as if she just couldn't sleep anymore. I have no idea why, because she should be pretty much used to it by now. I don't know about anyone else, but I NEED the lights to get dressed at 7:00 in the morning! What was the problem today????