When he’s awake, Mike Birbiglia dreams of being a successful comic. When he’s asleep, he dreams of making a neck pillow out of hot pizza. Thanks to his sleepwalking — the glum inertia of his days and the literal somnambulance of his nights — the wrong dreams are coming true.That’s the gist of Sleepwalk With Me, stand-up Birbiglia’s first feature as director, adapted from his own autobiographical piece (he suffers from “rapid eye movement behavior disorder”) for the radio anthology This American Life.