I noticed that lately during class I can't manage to stay up. Like at all. I can sit in class for like a minute and then start feeling drowsy ultimately putting my head down and falling asleep throughout the whole period! I've tried everything To stay up. Going out for a walk, drinking some water, trying to do work but I always go to sleep during class! I'm 15 weeks pregnant and I'm wondering can this be the cause or do I have some sleeping disorder...