Among peptides I tried epitalon, DSIP, and selank for sleep. Among OTC options I tried L-theanine, L-tryptophan, and 5-HTP. I tracked everything with an Oura ring and notes for one week each. DSIP, epitalon, and selank gave no REM or deep-sleep gains. Epitalon did extend total sleep time. L-theanine and L-tryptophan helped me fall and stay asleep but did not change REM or deep percentages. Trazodone worked: I now get about two hours deep and three hours REM and wake up refreshed for the first time in years. I am waiting to see if the compound mentioned here makes it through trials.