Before sleeping close your eyes and vesualize a big
clock.. visualize the hands of the
clock 12
o clock.Than one ,tw9, three. four, five and six. Now return to 12 o clock position by counting the reverse thai is 6,5,4,3,2,3,2,1,and 12.Do this for two or three times. then give a suggestion to your self that you getting up at whatever time you want to wake up. I have done this in my young age.You may also learn some hypnosis from some expert.