单选题 A lack of quality sleep not only affects how we feel during the daytime, but （1） ,which is vital in protecting us from common viral illnesses. Efforts nceded to sleepwell that include following a sleep routine，（请作答此空）and not drinking too much coffee.Allof these things are really interconnected in terms of their function.All of them （3）.The body is like an orchestra where there's an orchestra leader that's sort of the maintimer, but everybody else is playing it together and they're optimizing what they are doing.