Noctambulist 

A person who walks during their sleep sleepwalker

My little sister wakes up on some nights and starts running around the house in her sleep! She is such a noctambulist!

Noctambulist by DefinitionMaster67 December 30, 2014

nomnambulist 

a sleep eater, specifically someone who enjoys their food more while asleep than in waking moments.

Bob: "I just don't get why I keep gaining weight. Am I eating in my sleep or something?"

Bill: "You might be a nomnambulist!"

nomnambulist by gnardz December 24, 2012