GLRA1
GLRA1 glycine receptor — the molecular target that 1 compounds in the wiki act on.
In one line: A "calming brake" in the spinal cord that glycine presses to help you relax and sleep.
GLRA1 is the glycine receptor — another of the nervous system's "brakes," concentrated in the spinal cord and brainstem. The amino acid glycine presses it, which calms the nervous system and, combined with glycine's cooling effect on body temperature, helps you fall asleep faster.
This is part of why a few grams of glycine before bed improves sleep — it's gently pressing a calming brake while lowering your core temperature, both of which signal "time to sleep." Cheap and very safe.