There are some very spendy Gaba supps out there.
Kavinace Gaba is popular up here with LLMDs, its the sister of the company that has the iSpot lyme test in WS . There are several versions. I see they have a specific PM now too. The regular one just made me "drifty" , no REM sleep from it, and groggy the next day. But some really like it, probably depends ion if you need more GABA.
www.iherb.com/search?kw=Kavinace&x=0&y=0&bid=NOS&gclid=CNGamM7-gs0CFQiUaQodAL8DkQ#bid=NOS&p=1&rcode=wmg132