artificial photons coming from artificial sources as sort of um empty calories and how sunlight provided one isn't getting a burn and you know people debate uh you know how best to do that physical barrier everyone agrees on certain sunscreens are are safer than others some are very safe some are perhaps less safe in any event the point is that trying to make one's home environment dark at night is in my mind now uh akin to trying to avoid eating sugary uh you know non-nutritious calories at night as well