My son is 6 months, 2 weeks. He never has had an issue sleeping through the night and really is a pretty light napper. He usually just takes 3-4 30 min catnaps throughout the day. Well now, the past 2 days he has been napping MUCH longer than normal. Yesterday afternoon he slept over 2.5 hours in the afternoon. And now he has been out for over 2 hours as well. I know this is the norm for some babies but he NEVER napped like this before. I'm usually lucky if he goes down for an hour. What's up with this? I don't think I need to be concerned right?