Supplements for sleep

Are there any supplements that help you to sleep even when your histamine levels are elevated/during a flare?

I've tried at least half a dozen supplements suggested for MCAS - quercetin, evening primrose oil, HistaminX, magnesium, holy basil, astragalus - and while some of them help moderately with my daytime symptoms (itchiness and brain fog) I haven't found a single supplement that helps with my histamine-induced insomnia.

Any suggestions would be much appreciated!