Sleep2025n = 23
RCTHuman
This study tested how different doses and timing of caffeine affect sleep in men who usually drink moderate amounts. It compared a placebo, 100 mg, and 400 mg of caffeine…
Journal of clinical medicine2025n = 418 (199 males, 219 females)
Cross SectionalHuman
This study set out to examine how sleep quality and daytime sleepiness together affect injury risk in physically active university students. It analyzed data from 418 students (199 males, 219…
Reproductive biology and endocrinology : RB&E2025n = 18 peer-reviewed articles
Scoping ReviewHuman
This scoping review set out to map the evidence on how psychosocial work factors affect male fertility and sperm quality. It analyzed 18 peer-reviewed studies from 1990 to 2024, focusing…
Nutrients2025n = 14
RCTHuman
This study looked at whether a short, high-dose creatine (a compound stored in muscle that helps regenerate quick energy for short, hard efforts) routine improves sleep, performance, thinking, and recovery…
PloS one2025n = 7,306
Cross SectionalHuman
This study set out to see whether men who like and seek out sunlight have less depression and better sleep. It used 7,306 American men from NHANES (a large, recurring…