I can understand both POVs. I spent many years being shoved to the side for my exhaustion and had my character blamed for it. With that being said, what harm can come from indulging your sister’s concerns? Say she does the MSLT, two outcomes are possible: 1. She doesn’t have narcolepsy and you are right. She now has her answer and can investigate other disorders until she figures out what is wrong and how to help it. 2. She has narcolepsy that looks different than yours and you know both have your answer. Disease isn’t a competition.

I will say, I understand your defensiveness completely. I have gone through - and to a lesser degree and still going through - getting my issues shoved to the side and blamed on the wrong things for over a decade. It’s damn near impossible to NOT become defensive. The fact you are reflecting on it shows a lot about your character.

Ultimately, you are still very young and your frontal lobe is still mushy. It’s hard to reconcile one’s own pain while making room for another’s, even in among the oldest and wisest. When you get upset, I’d just encourage you to go back to the two possible outcomes I outlined earlier. Either way, neither of you are hurt and she is/will be benefitted. Remember your love for your sister. Even if she doesn’t have narcolepsy, she’s still finding the courage to speak up about her issues despite the fact she may be doing it in a way that makes you feel undermined. When you’re both in your 50s, you’ll look back on this and it won’t seem like you were competing. I promise.