You can't be serious here, surely?? [blah]
Nothing about this game is intended to be real, though it should be credible. When people play a simulation-style game, or a park management game, they expect (or should expect at least) said game to be as relatable as possible, and to mimic the real world as much as possible. The simple fact is, animals (prehistoric and otherwise) do sleep and rest, and so that feature should be in this game.
If anything is baffling at this point, quite frankly, it's your logic. Where's the proverbial line between reality and fiction for you? If Frontier released the game and all the Stegosaurus had two heads you'd surely complain about that, but using your own logic, because it isn't real anyway, that would be okay? No.
I'm glad someone else agrees.