For the past.. month or so, my girlfriend's sleeping habits have become a real problem. She used to take long naps every day or every couple days, but now she's starting to hit the bed as soon as she gets home from class. Her night sleeping habits havent changed, usually a good solid 6-8 hours every night, but she's starting to sleep during the day more and more. It's really impacting our time together, I haven't seen her in a good week. We had plans at least 3 times this past week, and we havent been able to follow through with them because she just falls asleep when she gets home.
Is this a sign that something is wrong with her, or what?