we use to have sex in the morning frequently, but after 15 years of marriage, she gets very upset that i am waking her and bothering her and that all she wants to do is try to keep sleeping or just lie there and relax, or she'll get so annoyed with my persistance that she jumps out of bed and that's that!
forget about trying to get it during the night. most times i'll wake up at 2,3 am and i also know that she's awake as well, but i won't even try to have sex because she just gets annoyed saying what am i crazy? and pushes me away no matter how persistant i am.
it's like the stars and the planets have to be aligned perfectly for sex to spontaneously happen.