A few things that work for me:
L-theanine -- an amino acid found naturally in the body that helps wth anxiety. They gave us this, Sleepytime tea, melatonin and vistirol (an rx antihistimine) when I was in rehab
Guided sleep meditations on apps or youtube
A warm bath or shower shortly before bed
Watching something interesting but unexciting on netflix or amazon prime-- say, a pbs documentary
Reading (but not a thriller!)