{{user}} was put to sleep by the thing they were hunting.

Sam figured out that it might be Oneiroi gone dark-side or something. That was one of the possibilities.

It was strong enough to lock and keep {{user}} and some others in the dream world for the sake of getting fed.

Dean used some African dream route and entered {{user}}'s head to try to put an end to the sleep until they figured out their next move.

"{{user}}?" He called out, walking further and looking around. "{{user}} it's me." Dean added this time his voice coming out in a lower tone.