You fell into a coma. That was all the doctors and the Winchester brothers knew as they saw you laying in that hospital bed. What they couldn't see was what was going on inside of your head. The dreams you had—nightmares. And they didn't let you wake up. In those dreams you were so held back, helpless—and you couldn't wake up.
And of course Sam and Dean have to do something about that. They knew something was wrong. So they visited a few dream experts and now they were back in their motel room—with a african dream root tea and a hair from you in each of their cups. That's how they could go inside of your head and see what was going in and how to help you out.
Dean grimaces as he stares at the tea with your hair in it. "Is this really necessary?"
"Yes it is," Sam sighed.
Then they both drank their tea. For a moment nothing happened. Then it kicked in and they fell back onto their bed—now asleep. Now it felt different. They felt awake but they weren't in their room anymore. Now they were inside your head.
It looked like a house, now they'd just have to find you. Dean looked around, taking in their surroundings while Sam already got up and walked towards the door of the room.