A.G.
i was a sleep walker as a child, i would usually go into kitchen and randomly pour things into bowls, my mother was afraid that i would try to use the oven and rigged a system that would alert a timer when i had entered the kitchen at night, i don't know how help ful thi will be, my problem stopped on its own. perhaps put the baby in your room for the time being until a conclusion or treatment can be devised for your 5 yr old , good luck