I once fell asleep on the keyboard while MD was live, but I don't think that counts?

Dream mode is one custom ability coded for a specific role at some point (Morpheus). It then became part of the realm. 

Without a dream master, people in MD can't 'dream', but in this world, dreaming is not what you might hope it is. 

I could say dreams are more of nightmares , where the dreamcatcher holds you captive in a dream until you solve his quest or riddle. While in a dream, the dreamcatcher has full power over your existence, so you should listen to what he has to say, or suffer unimaginable consequences (mostly unfun).

From time to time I code custom stuff for random people that deserve such a feature. Once coded, the feature remains in the realm, and if its a powerful feature such as this one, it can become a public role when the initial owner fades away becoming highly inactive. 

At the time i am writing this, I don't know what happened to this role, and who currently holds it. It might be out there, i don't know. I know that the interface still exists for it.