I haven’t read the paper, just looked at their plots, and my impression is that there is nothing there but noise.
That may be true. The correlation is at best weak. There appears to not necessarily be a causative link between vit. D and daytime sleepiness; increasing my vit. D levels had no perceptible effect on my own sleepiness. Though others have had different experiences.
We have anecdata, but have there been actual studies?
I have not seen any studies into that. The closest that I’ve seen is gwern’s tests.
That may be true. The correlation is at best weak. There appears to not necessarily be a causative link between vit. D and daytime sleepiness; increasing my vit. D levels had no perceptible effect on my own sleepiness. Though others have had different experiences.
I have not seen any studies into that. The closest that I’ve seen is gwern’s tests.