while the 767 flat bed is the way to go for a flight where you definitely want to sleep (redeye), i don't mind the 757 cradle sleeper seat for daytime flights when you want to just be cozy and comfortable.

the new 757 BE cabin looks very nice! ^ i've always been a fan of the intimate/quiet nature of the sCO (UA) 757 lie-flat birds and the Delta cabin looks even sharper!