Justin Chambers voluntarily checked himself into UCLA's psych facilityin January of 2008. He says he was "exhausted" as he suffers from a sleeping disorder. The stay was brief and he was checked out shortly after.

Justin later explained, "It's an issue that I've had for a while. It's a biological sleep disorder. Your mind keeps racing, and your body is tired. It wants to go to sleep, but it can't." Before checking himself in he reportedly was only sleeping about an hour a week and was at his "wit's end."

(source: people.com "Grey's Anatomy's Justin Chambers Treated at Psych Ward" January 31, 2008; people.com "Justin Chambers Opens Up About Sleep Disorder" March 27, 2008.)