Yuū Nishinoya X Male reader// The fatal familial insomnia

M/N L/N has a rare mental disorder, called Fatal Familial Insomnia, Fatal familial insomnia (FFI) is a very rare sleep disorder that runs in families. It affects the thalamus. This brain structure controls many important things, including emotional expression and sleep. While the main symptom is insomnia, FFI can also cause a range of other symptoms, such as speech problems and dementia.

There have been some stories about a male reader x Nishinoya but none of them have the mental/ sleeping disorder that this comes with, if you know what this FFI is I'm sorry, you probably have it, a family member has it or you've come from the In another life fanfic, so..