Options for hypersomnia (not insomnia!)? Semax?

I have Idiopathic Hypersomnia and for 20 years Modafinil has enabled me to get to approximately the same levels of daytime alertness as others.

Recently however it’s just not working the same. I have brain fog and daytime sleepiness again, plus terrible inertia and executive dysfunction. I have checked my levels of everything and am doing all the vitamins/diet/exercise/caffeine/creatine things I know of.

I’ve previously tried NAD+ and BCP-157, with no effect on anything.

I’m considering trying Semax and would love to hear experiences of that, plus any other recommendations for these issues.