Brrrr, that was scary! I suspected this would not be a happy reunion even if Snape woke up, what with Harry isolating himself and fleeing into dreams, and the constant presence of the baby and the way Harry comes to care for it almost by accident, and most of all Snape's warning to leave things alone... Still, the ending gave me shivers. I wonder whether it has always been Tom, impersonating Snape, or whether waking Snape's body gave him the power to chuck Snape's mind out of his body... It's the sort of ambiguity that leaves you pondering, and I enjoy that lots in a fic.
I loved the contrast between Harry's 'real' family life (ever-so-slightly overtaxing him, but Ginny even more) and his 'dream life' with Snape and the baby - both are such, well, mockeries of each other.