Not gonna try to find a specific example, but just from having listened so much to the Stronger by Science and Iron Culture podcasts for the past few years, the

Not gonna try to find a specific example, but just from having listened so much to the Stronger by Science and Iron Culture podcasts for the past few years, there have at least been numerous studies and metas over the last decade examining the effects of sleep on weight loss and weight gain as it pertains to bodybuilding goals. I don't recall any having showed an impact on the rate of gain or loss but duration of sleep opportunity definitely has an impact on the quality of gain or loss. That is, you lose more muscle and less fat losing weight while sleeping poorly, and gain more fat and less muscle when gaining weight while sleeping poorly.