It's happening here right now. Our 10 month old was sleeping through to at least 5:30, sometimes 6, but is now waking at 4ish and needing a cuddle - I bring her into bed and the first thing she does is look to DH's side of the bed to look for daddy. We skype, but she doesn't quite get it. So I've just been explaining to her where he is, and every night before I take her in to her bed, we count the sleeps til daddy gets home.

I just hope it goes back to normal when he gets back, and same for you!