I am taking Circadin 2 mg which contains melatonin, for sleep problems. I sleep 4 hours then am unable to go back to sleep. I exercise every day , alternate gym and jogging. I am 75 years old. I have a busy mind so I write up my diary and make a list for the next day before putting out the light. I do relaxation yoga for an hour once a week. I often have a sleep tea before going to bed and go to bed between 9 and 10 p.m. But still wake around 2 a.m. I also take magnesium citrate 100 mg . How can I achieve more sleep.