Unable to sleep. Dark and cool enough.

Hello Doctors, I am a lite sleeper since childhood but from the past 3 years , I'm facing serious to get a peaceful sleep. I wake up tired every morning. It takes like 1 to 2 hrs to fall a sleep everyday and sometimes i stay awake all night just unable to get sleep. The problem i face is that my mind stays active .It keeps on thinking of some random stuff like cricket or movies or games or something else. Sometimes i feel my head will burst due to continues thoughts. My job shift starts from 2pm afternoon till 11pm. I have my lunch between 8 to 9 pm and i sleep at 12 pm everyday. I cannot sleep earlier than this due to my job. I wake up at around 10 am in the morning. I do not have any job pressures or anything to stress about infact i love my job and presently enjoying my day time . I have tried these following: 1)Took homeopathy treatment for 6 months 2) Going for a walk+jogging daily (4kms per day ) from past 2 months. 3) regular stuff like maintaing room dark and cool enough.