This Cabin belongs to the children of Hypnos, god of sleep.

Hypnos' cabin looks like an old-fashioned prairie house. It has mud thatched walls and rush roof. Red poppies cover the door. Inside there's a fireplace with soft violin music playing, and the air smells like fresh laundry. Which makes people extremely sleepy. Above the fireplace there's a branch from the poplar tree from the Underworld, which drips water from the River Lethe into tin cups. There are lots of empty beds with feather pillows, fresh sheets and fluffy quilts.

The Hypnos cabin makes everyone feel like sleeping, with its cozy and comfortable feel. The cabin has been described as being more dangerous than the Ares' cabin.