C.M.
Hi D.!
It could be that your son finally realized that mom and dad are spending time together away from him! He could just want to be part of your alone time. My son, at 10, was constantly trying to steal more time at night by asking for a cup of water, using the bathroom, getting a snack, needing a hug, etc. I have to set the rules for him, give him all the necessities before bedtime, and make him giggle at least once before I leave his room. (I don't know about the giggling thing...it seems to help him.) I know he's much older than yours, and I still wake up once in a while with him in my bed, (not cool) but he says his bed is uncomfortable. Until I can resolve THAT issue, I'll just keep being firm.
C.
PS- If you check out "Member Perks" on this site, there is a wonderful linked site for CDs or Books tailored with your child's name in them. I listened to samples of the CDs, and the lullaby one is absolutely fabulous. I'm ordering it for my niece.