Maybe Loki doesn't feel threatened by Clint and that's why he fell asleep. Or maybe, more morbidly, his own death fits into some sort of plan of his.

Whatever the reason he fell asleep doesn't matter. He's a light sleeper and is awake the moment he feels someone on the bed. He tries to jerk away, sending a sharp elbow back at Clint. He doesn't manages to stop his fingers. There's a choked pained groan. "Release me," he hisses then tries to push himself free of his fingers.