I think I had this with previous pgs but can't remember. I'm now 31 weeks and seem to have developed the ability to fall asleep instantly (but only in daytime, natch; nightime sleep is disturbed) It is almost exactly like the Grandpa Simpson sleeping: finish sentence, head goes back, instant snoring. I've been asleep like this on and off half the afternoon (while DS pottered all over me and occasionally asked me to pretend to be a lion) but still feel like I could go straight to bed now.
Normal or any cause for concern?