If you get enough sleep every night, you'll feel much better.
Literal
Every-night sufficient sleep [object-を] take-[conditional-ば], you [topic-は] much mood [subject-が] become-better [probably-だろう].
睡眠をとる ('to take sleep') is the formal set phrase for 'to get sleep' — 取る here paired with an abstract experiential noun. ずっと ('much, by far') is a common intensifier for comparatives. 気分がよくなる ('mood becomes good') is the idiomatic 'feel better.'