Vaermina

Lady of Nightmares, Vaermina is probably the most feared among all deities. She attempts to infiltrate the minds of mortals in their sleep, instigating night mares in their minds. Few mortals are known to pray to Vaermina, though she may very well be the easiest deity to contact: the correct concoction allows one to travel as an ethereal into her plane of oblivion during one's sleep.

Quagmire

Vaermina's plane of oblivion 'Quagmire' is filled with horrifying nightmares, though most are illusions. The only known lesser Daedra to reside in Quagmire are the 'Dream Catchers'. Upon passing of the plane of Quagmire, mortals are known to sleep little to none. Many seek the aid of healers in these times to protect them from Vaermina's poisonous thoughts.