Yeah, I've always had issues with Before I Sleep. Leaving aside their previous experience with entities taking people over (which I had never thought of before and am now facepalming over), who the hell thought it'd be a good idea for the two more senior personnel to be the ones to take on the entities? Elizabeth was an accident, so there is leeway there, but Sheppard? Caldwell and Lorne should have protested vociferously.