Peer-reviewed research concerning nervous, summarized and appraised in plain language with every source cited.
This meta-analysis set out to clarify how sleep deprivation affects testosterone levels in healthy men. It pooled data from 18 studies involving 252 men, comparing testosterone levels after partial sleep…
This study set out to see how severe sleep restriction affects appetite, food intake, and appetite-regulating hormones in healthy young men. It compared three nights of very little sleep (2…
This study asked whether a man's tendency to zone out after short sleep predicts whether his working memory and spatial skill keep improving with practice. Fifteen healthy young men slept…
This study looked at whether changes in how alert, motivated or effortful a man feels explain why some handle sleep loss better than others. Fifteen healthy young men had three…
This study set out to see whether a regular daytime coffee habit disturbs sleep in young men who already drink it. Twenty men went through three 10 day conditions, daily…