I never found zopis to helep, except one timei took a stuopid dose, and literally zombied out, checked my watch after stearing absent mindedly at the wall and 6 hours had passed! Plus that metallic taste..
If you can train your body to sleep wiothout ther use of chemicals, using breathing/meditation techniques or just lying there till you drop off (even if itsd a few nights of no skleep, you eventually will), the body learns your habits. Though saying that ui've been an insomniac since i was a kid, and its recently got much better just from exhausing myself throug hthe day, still many a sleepless night but not to the point where i was going insane with frustration / sleep deprivation like at my worst