Evidence check: Testosteron in the context of Schlaf

The link between testosterone and sleep is bidirectional and supported by human studies. Sleep deprivation, especially reduced slow-wave sleep, lowers morning testosterone levels – in young men, one week of five hours of sleep can reduce levels by 10–15%. Conversely, low testosterone can impair sleep quality, increasing nighttime awakenings and worsening sleep apnea. MyBody-X hormone tests measure testosterone but do not assess sleep. Results are a snapshot and should not be used alone to guide supplementation or hormone therapy. Evidence is human-moderate (controlled studies exist, but context lacks specific references). Caveat: testosterone therapy carries cardiovascular risks and may worsen sleep apnea; always consult a physician before starting any hormone regimen.