Hasn't this already be researched quite a lot with Laptops and PC's? I thought it was common knowledge now that the light emitted from those devices would effect your sleep. A sample size of 12 isn't good but I'm sure there are much more comprehensive studies that have already been done on this. I think they're the reason apps like Flux exist.[1]

[1] https://justgetflux.com/

Good Man. Unfortunately, lots of piss-poor researchers out there write study reports with very small n sizes, and 12 is not the worst one I have seen.