Low hard erection. Rather than at night.

Dear doctors I dont know what is wrong with my penis..sometimes i loose erection and hardness... to be frank i feel myself more sexually active in the morng rather than at night...i am really confused about this..it may sound weird but its the fact..sometimes i get good erection at night..its jus lik 50-50 chance of getting good erection at night...and at the tym wen i get low erection...i could feel that  the mid portion and the left side of my penis is little hard wen i touch.........and i have a curved penis (by birth)...but i don have any pain or anything like that...i think i don hav any symptoms of peyronie disease..i surfed a lot regarding this on internet but no pain when its erect..... when i get good and strong erection(espcly in the mrng when i wake up)  i don feel any problem and i last long ...so doctor can u pls tell me what is this medical condition called? Please reply...