what causes mens penis to errect in mornings

Question: what causes mens penis to errect in mornings
- Keywords:
  erection
Asked by base20fen to Sally, Mmboyi, Mike, Michael, Jacinta, Gliday, Elkana, Edna, Arnold on 17 Jul 2025.
- Michael Kimwele answered on 17 Jul 2025:
  
  Morning erections, also known as nocturnal penile tumescence (NPT), are primarily caused by a combination of hormonal fluctuations, sleep cycles, and the body’s natural relaxation during sleep. Specifically, testosterone levels are often highest in the morning after waking up, particularly after REM sleep, and this increase can trigger an erection even without physical stimulation. Additionally, the body’s parasympathetic nervous system, which promotes relaxation, is more active during sleep, and this can lead to increased blood flow to the penis.

Question: what causes mens penis to errect in mornings