Undersleep is a drowsy and somnolent Psymonster who knows when is really time to get up already. Undersleep isn't quite ready to face the morning yet. She was just having a totally marvelous dream about taking an adventurous journey in a supernatural world full of rainbow heroes with increasingly powerful abilities to shoot lightning, or it was possibly the one about the time machine powered by antediluvian hats. Any Psymonsters can rise and shine when the bed is so comfortable and any Psymonster has got a favorite toy to cuddle with. Everything will be all right, Undersleep will be up in a minute. Perhaps she will just close her eyes and grab a quick nap first. After all, any Psymonster can't get through the day without plenty of rest.
She is a blue parrot with a violet eyes, a green head, a pink belly, a yellow beak and legs, and a red sleeping hat.
- Undersleep is one of the three Bird Psymonsters who wear accessories (the other two are Kimono and Asiaqueen.