Testosterone levels follow a circadian rhytm. They peak in the morning and slowly plummet towards the evening…
…And when you’re in the REM stages of your sleep, the endocrine system comes to life. Your brain starts sending signals down to your gonads, telling them to produce massive amounts of testosterone, preparing you for the day ahead.
The guys who had slept for 4 hours, had testosterone levels howering around 200-300 ng/dl.
Compare that to the guys who slept for 8 hours, they had their levels at around 500-700 ng/dl.
In fact the guys who slept for 4 hours had about 60% less testosterone in their serum, than the men who slept for 8 hours.
Symptoms related to lowered levels of testosterone include:
* reduced desire for sex
* fewer erections that happen spontaneously, such as during sleep
Despite that fact that it can cause lower energy levels, low testosterone can also cause insomnia and other changes in your sleep patterns.
Sleeping deprivation lowers your IQ, as well as your performance on academic tasks. It impairs your impulse control, memory, decision-making ability, and even your brain’s ability to take up glucose.
Sleep poorly, and you’ll have less muscle mass, more fat, and less testosterone. Does that mean your sex drive might take a dive? You bet your dick it does.
Men with lower testosterone levels had lower sleep efficiency, with increased nocturnal awakenings and less time in slow-wave sleep as well as a higher apnea-hypopnea index and more sleep time with O2 saturation levels below 90%. Low testosterone levels were associated with overweight.
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