Does anybody know WHY the Fedex custom critical straight trucks have such a big sleeper?

Posted by PresentationLive943@reddit | Truckers | View on Reddit | 33 comments

Everyone has seen the Fedex custom critical freightliners with the tiny box and the mega sleeper and I know it's for FedEx freight that is expensive and needs to be moved asap.

However what's confusing me is there are tons of super trucker teams that run 24hrs just like the Fedex custom critical drivers and they seem to be fine in a 70 inch sleeper? Why do they need such a giant sleeper? Are there 4 driver or something?