Hypnos' cabin is an old-fashioned prairie house. It is made of mud walls and a rush roof. A wreath of red poppies hang above the door. Inside, there's a fireplace with a crackling fire. Above the mantel hangs Hypnos' symbol: a poplar tree branch dripping water from the river Lethe, with the water dripping into a collection of tin bowls. Soft violin music is always playing, and the air always smells like fresh laundry. There's warm milk in the cabin. There are always plenty of empty beds, all with feather pillows, fresh sheets and fluffy quilts. The Hypnos cabin makes everyone feel like sleeping, with its cozy and sleepy feel, and is described the cabin as being more dangerous than the Ares' cabin.