How does sleep affect testosterone levels?
Sleep plays a vital role in testosterone secretion, with approximately 70% of daily testosterone produced during REM and slow-wave sleep. A study published in JAMA found that restricting sleep to just 5 hours per night can lead to a significant 10-15% drop in testosterone levels, mimicking the effects of aging.
✦
This is one answer. The complete system — the psychology, the biology, and the method — is in the book.
Read The Willpower Lie →Found an error? Let me know →