I did very tough 2 hours GYM exercises for a week and tired a lot a lot, and also walked several steps a day to reduce weight, additionally, I wake up until late night 12 pm for a week and then after 3 days of sex with wife on the forth day I felt that my penis is not getting up, no feeling etc...and feeling sleepy....is this common? will it be okay after some days full rest? I never experienced such situation before and had a very healthy sex life with full strength...please advice...will it be okay after some days enough sleep and rest..?