Bad sleeping habits create havoc on your body and soul. Mine are also bad. I can never get 6 hours of uninterrupted sleep. more like 2-4 hrs sleep, then wake up and struggle to get back to sleep. So hardly go into REM (rapid eye movement, I think, which means going into deep sleep).
Your body needs to
Repair itself during sleep especially during REM, and building collagen is part of the
Repair. So I think lack of sleep can have an impact on
PMMA Girth gains.
I have lost some gains throughout my
PMMA rounds, and I attribute that to age, lack of sleep and stress which has been a bit higher lately for me... I may have lost about 0.2\" in
Erect Girth after about 6-7 months of my last PMA session.