When, I worked, I went to bed at 1100pm, got up at 3:30am. I did this for 20 years. So, when I retired, I changed that awful schedule to 10;00 pm till 9:30am. Sounds usually wake me up, music, talking but I think of my room bathed in white light and my pillow is a cloud so I float back into sleep.
Its important to change your way of thinking. If you wrestle with your brain, it will wrestle back so if it's totally impossible then try this - Hylands -Homeopathic medicine. Try #6 ,it literally calms your whole being down and whatever you are thinking about at that very moment, it gets shoved in the back of you, literally. Your mind is free to drift and let it , till your eyes start to droop, your brain quiets down, and you simply fall asleep. It's the only medicine that has actually worked for me, so give it a try. It won't harm the body at all.