Peer-reviewed research concerning sleep & circadian, summarized and appraised in plain language with every source cited.
This study looked at how light exposure affects sleep in professional athletes. It tracked 17 male Australian Football players for 14 days, using wrist devices to measure sleep and light…
This study looked at whether taking ZMA, a supplement combining zinc, magnesium and vitamin B6, before bed for two nights could improve sleep and next-day performance in healthy active men.…
This study looked at whether short-term sleep loss affects bone health markers in healthy men. Twelve men who normally slept 7-9 hours a night spent time in a sleep lab,…
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 how cutting sleep affects glucose handling and hormones in young men. Fourteen healthy men were kept in a laboratory for two nights of 10…
This study looked at whether cooling the scrotum overnight improves semen quality in men with a history of undescended testicles and a low sperm count, a group with few options…
This study looked at whether reducing genital heat could improve semen quality in men with a poor sperm count, poor movement and abnormal shape. It compared those men against men…