male erection after wake-up?

because we are not sexually deviant and don't fap every hour. No but seriously its natural, its your body letting you know its another day another life lesson. Mornings turn your body on because of there potentialities. Heck you could finish some artistic masterpiece before the end of the day, wouldn't that turn you on to? Seriously though the only thing I can think of is it might be related to wet dreams, or testosterone ramps up when you wake up. Also biologically your more likely to be somewhere comfortable when you wake up, aka ready to be fruitful and multiple w/ somebody.

Testosterone levels are at there highest in the morning.