Sometimes watching TV can make us feel as if we are learning something. If it doesn't, and particularly if it drags you down in some way, then don't use it for credit. Sleep is difficult to use as credit. Sleep should be a part of everybody's program, yes, it's true. And it is not a waste of time.
Sleep is sleep.
Deciding if a certain activity counts as credits really is a matter of the spirit you bring to the project. And one person's waste of time is another person's epiphany. We all do things that are a waste of time for many different reasons.