They're both critical. If you only have one, the other will be less effective (lean muscle loss versus fat gain when sleep deprived, a diet that disrupts sleep,

They're both critical. If you only have one, the other will be less effective (lean muscle loss versus fat gain when sleep deprived, a diet that disrupts sleep, sleep onset latency when there's no exercise) and/or more risky (increased injury risk when sleep deprived). Although, I wonder _if_ the false dichotomy were entertained, what will contribute to quantity and quality of life more.