Guys who run on five or six hours of sleep often resist -- despite research to the contrary -- the notion that more shuteye means better health. Perhaps their minds will be changed by the possibility that sleeping increases not just mood and mental acuity, but testosterone:
The testosterone levels of healthy men decline as they get older. Assleep quality and quantity typically decrease with age, objectivelymeasured differences in the amount of sleep a healthy older man getscan affect his level of testosterone in the morning, according to astudy published in the April 1st issue of the journal SLEEP. [...]
"The results of the study raise the possibility that older men whoobtain less actual sleep during the night have lower blood testosteronelevels in the morning," said Penev.
Want more morning friskiness? Go to bed sooner.
Sleep quantity affects morning testosterone levels in older men [press release]
