Nemuiflux is when one doesn't have a gender when they are too sleepy or tired, but has one when they aren't as sleepy/tired, or aren't sleepy/tired at all. For example, when one is tired they will feel agender, but when they aren't tired they will feel like a demiboy. Nemuiflux can be considered a subset of genderflux.
History
The term was coined by Lovenderr on the LGBTA Wikia on February 12th, 2021.
Etymology
Nemui comes from the Japanese word for sleepy, and flux means to fluctuate.