Molly (Ashley Bell - A Neighbor's Deception) and husband Brad (Dean Geyer) are first in their group of friends to have a child and Molly is struggling with motherhood whilst dealing with postpartum depression. It is why she ends up registering with an online forum for mothers, which is where she meets Beth (Sara Rue - Nightmare at the End of the Hall) who seems great and gives Molly the confidence boost she needs. Before long Beth is moving in to keep Molly company whilst Brad is on duty with the fire brigade. But slowly Beth appears to take over Molly's life until one day her baby goes missing.
"Don't Wake Mommy", which is also called "Dark Intentions"" starts with Beth going full out psycho on a doctor and his wife, claiming he got her pregnant and grabbing a kitchen knife, firstly threatening to kill herself and then the doctor. Jump forwards a little while and after befriending the struggling Molly online Beth enters her life and whilst Beth is sweetness and light towards Molly she is threatening and cold to her friends. After those two sentences I am now losing the will to live because despite having a fondness for Sara Rue "Don't Wake Mommy" is such a typical Lifetime movie that you could stop watching after half an hour and not only know what is going to happen when it comes to Molly and her baby but also Molly's friend who doesn't hide the fact that she is suspicious of Beth.
The worst thing about "Don't Wake Mommy" is it fails to really bring any life to this "Hand that Rocks the Cradle" style storyline. It makes it one of those movies you watch and wait and then wait some more for something exciting to happen. And then you reach half way thinking maybe nothing exciting is ever going to happen other than Sara Rue's character clearly belonging to the dark side as she delivers one catty look after another.
What this all boils down to is that "Don't Wake Mommy" is like an introductory Lifetime movie for those who have not had the pleasure and pain of their particular brand of entertainment. But if you are a veteran Lifetime movie fan this fails to come up with anything new to make it worth the time.