If I had a nickel for every time a black actor played a stoic alien who said “Indeed” a lot I’d have 10 cents, which isn’t a lot but it’s weird that it happened twice.

He doesn’t sleep as a physical necessity like humans, for example. It is a programmed cessation of normal mechanical functions that includes a dream creation program, so it is still a form of sleep even if it does not serve quite the same function as a humanoid.