My baby did the same thing for a while. Like some of the other members mentioned, try giving her a small snack right before going to bed. That worked wonders for Rylee. In fact, just this past Tuesday night, I couldnt let her have a snack before bedtime because she was having a procedure done at the vet the following day. Sure enough, about 3am she threw up.
__________________  Janis, Rookie and Rylee Belle  |