Since he is a cyborg does he need to..

Eat, drink or sleep? Or does he not really need to, he just does it for the enjoyment?

He still has biological organs, so I'm pretty sure he does.

Interesting point-as some of his organs are still human, I daresay Beta Ray Bill still needs to eat, sleep (and go to the toilet if you want to get crude). It is also interesting that Wonder Man and the "new X-Man" known as Mercury also eat and presumably sleep not because their bodies require it- he is a being of ionic energy and she is a mutant whose body has transformed permanently into a form of organic metal not unlike that of Colossus- but because ingesting organic foods makes her "feel human" as Mercury explains to a teammate).

Terry