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Cutting back on sleep drastically lowers testosterone levels in young male adults. Less than five hours a night of sleep had significantly lower levels of testosterone than controls. After just one week of less than five hours a night of sleep resulted in a 10-15% decrease in testosterone levels. Low levels of testosterone lead to low energy, reduced libido,...

  As we get older, especially men who are frail, testosterone replacement is a consideration to improve muscle strength and balance. Exercise, of course, is the best way to increase muscle strength and balance because it naturally increases growth hormone and testosterone levels. Overdoing testosterone levels can be a problem with aggressive behavior...