desire (or rather lack of)

OK, So I'm almost 29 weeks pregnant, I would like to be more intimate with my husband.  Though for some unknown reason, at least it is unknown to me. I have very little desire lately.  It is bugging me and frustrating the heck out of my husband.  He told me tonight that I do not even let him snuggle up next to me in bed at night or let him put his hand on my tummy.  I have no clue on that one.  I really do not remember things at night that happen while I'm sleeping.  I need some helpful advice on this subject please.  GRR!!