Other than sleeping pills, or anti depressants, the only thing available is Sleep Hygiene. You can Google, and there are useful tips, if you are doing things you did not realize that affect you sleep, and there is some advice to help people sleep. Sadly that it does not work for some people. Even if you go to sleep doctors in clinics, ultimately the only advice and help can be found in the advice found on the pages of Sleep Hygiene. If you have not tried it, maybe you can give it a try.
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Nothing lasts but nothing is lost