Serendipity In Your Arms

Set post-Swan Song. In result of Sam being locked in Lucifer's Cage, Dean has vivid nightmares. When his insomnia becomes too hard to ignore, he leaves Lisa's house and throws himself into hunting again. But as the demons in his head continue to haunt him, he pushes himself to the point of exhaustion. When Castiel returns, he provides a...unique solution to Dean's problem.