Low Testosterone Starts In Your Eyes (Avoid This Before Bed) : 1416

Testosterone is made during the earliest stages of deep sleep

Dave Asprey explains that the body produces most of its testosterone during the first part of the night in slow-wave (N3) sleep, and that pushing bedtime later or fragmenting sleep compresses the deep sleep window where hormone pulses are strongest.

"most men don't understand that the body makes most of its testosterone during the earliest stages of deep sleep. That's when a small gland in your brain, the pituitary, sends strong signals that tell your balls to release testosterone."

Screen light before bed shuts off the testosterone switch

Dave Asprey argues that the real driver of falling testosterone is not aging but how the body interprets environmental light signals at night, with screen exposure before bed disrupting the circadian triggers that initiate testosterone production.

"testosterone decline has a lot to do with how your body interprets your environment at night. Most people live in today, almost every single person does something to their eyes before going to sleep that tells their brain to shut off the very switch that creates testosterone,"

You cannot out-supplement or out-lift broken deep sleep

Asprey emphasizes that misaligned sleep is a primary driver of declining testosterone, not age, and that no amount of supplementation or weight training can compensate for a body that never achieves adequate deep sleep.

"if you want to raise your testosterone levels, you have to fix your sleep clock. You can't out supplement or out lift a body that never gets deep sleep."