I had severe idiopathic hypersomnia for several years, which is very similar to narcolepsy (which interestingly went away as soon as I got Covid). I was prescribed the medication modafinil as a treatment. It worked well as a non-jittery medication to keep me awake during the day. Perhaps it would be helpful to you. I think some studies have looked at it as a treatment for sleepiness caused by Long Covid.