- l-theanine especially, it improves sleep quality and reduces sleep fragmentation, with no downsides whatsoever and other positive effects (look up theanine and GABA)

- magnesium helps some people but I already take a lot of it and am replete so I can’t tell the difference

- sufficient physical activity (i.e. 10k steps or equivalent)

- well-designed sleep mask that leaves room around the eyes