I think it would be interesting to see statistics on this. Some examples could be: What frequency of people suffer from nightmares? How do they rate it on an intensity scale? What's the proportion for whom nightmares affect their everyday living? Are there DALYs associated with nightmares (probably such data won't be available, but it could be interesting to explore)?
The data might come from either current studies or from future ones that you/others might want to conduct.
Thanks for your efforts and for putting this together. This can go a long way for both Muslims and EA.