I'm currently exploring the connection between humidity levels and MCAS.

I have now slep well for a week with a blanket over my head (it's a light blanket and there's an air pocket, so that my nose is never right up against the blanket), and I think it's related to the higher humidity. I found this paper connecting mast cell degranulation to humidity levels:

https://www.sciencedirect.com/science/article/pii/S0022202X15402830

Also, when I would get a rash (for no apparent reason) in the past, I held a plastic sandwich bag against the skin, which...

I'm currently exploring the connection between humidity levels and MCAS.