Can Silence Actually Drive You Crazy?

*Watch with headphones on!
Check out Audible: http://bit.ly/AudibleVe
Is 45 minutes really the longest anyone can stay in a perfectly silent, pitch-black room?
Want to watch the whole hour of silence? http://youtu.be/jr1UMFC9DV0

Many stories have circulated claiming the longest anyone has stayed in an ultra-quiet anechoic chamber is 45 minutes, the reason being any longer would drive you insane. To me this sounded like unsubstantiated rubbish, like the claim the Great Wall is the only manmade s