A 2005 clinical study published in ๐๐ฉ๐ฆ ๐๐ฐ๐ถ๐ณ๐ฏ๐ข๐ญ ๐ฐ๐ง ๐๐ญ๐ช๐ฏ๐ช๐ค๐ข๐ญ ๐๐ฏ๐ฅ๐ฐ๐ค๐ณ๐ช๐ฏ๐ฐ๐ญ๐ฐ๐จ๐บ & ๐๐ฆ๐ต๐ข๐ฃ๐ฐ๐ญ๐ช๐ด๐ฎ researched an important question: Is testosterone influenced more by when you sleepโor how long you sleep?
In a controlled lab, 7 healthy men were monitored for 24 hours while sleeping either:
โข At night (11 PMโ7 AM), or
โข During the day (7 AMโ3 PM)
Results:
โข Testosterone levels rose steadily in both conditionsโfrom ~15โ17 nmol/L to ~25โ26 nmol/L
โข Circadian rhythm had a minor influence but sleep duration was the primary driver of testosterone production
This study suggests that it’s not when you sleep, but how long you sleep that matters most for testosterone.
Study Link: https://pubmed.ncbi.nlm.nih.gov/15914523/