I've dealt with this most of my life. There was a time when I simply got up after 3 to 4 hours instead of tossing and turning the rest of the night and just started my day. Later I took a good solid nap and I felt great. If you can do a schedule like that I highly recommend it.
I do not recommend melatonin or other sleep aids except possibly low dose Trazadone which is widely used and very safe. Melatonin is a hormone and if you take it your body stops making it. You can make it naturally by getting up early and getting direct sunlight which sets your internal clock.
I only sleep well when I live like a monk.....never get upset, work easily but all day, read, meditate, get early sunlight....but I can't live like a monk....it's not in me.