Hipnos lived in a palace built inside a large cave in the far west, where the sun never reached, because no one had a cock that would wake the world, nor geese or dogs, so Hipnos always lived in tranquility, in peace and silence. On the other side of all this peculiar place passed Lete, the river of forgetfulness, and on the margins, plants grew that, together with the murmur of the clear waters of the river, helped men to sleep. In the middle of the palace there was a beautiful bed, surrounded by black curtains where Hipnos rested, and Morpheus was careful that no one woke him.
He is often seen wearing gold pieces, as opposed to his twin brother who normally wore silver tones. He can also be portrayed as a naked young man with wings, playing the flute. It is sometimes shown as sleeping in a feather bed with black curtains around it. Its attributes include a horn containing opium, a poppy stalk, a branch dripping water from the river Lete ("Forgetfulness") and an inverted torch.
Pausânias, in his work Description of Greece, mentions several times the presence of statues of Hypnos beside his brother Thanato.