[jeremiahlee]

Hi, I'm the author. I read over 20 studies before writing this post and stand by my conclusion: there is not conclusive evidence blue spectrum light specifically is worse than other illumination.

I only linked to the most interesting outliers that could not reproduce the most cited study's findings. I also linked to the most rigorous study (3 groups: using Night Shift, not using Night Shift, not using phone at all in a natural setting instead of lab) with the largest sample size (167 people) and duration (7 consecutive nights) that found no observable benefit from using Night Shift, only not using a phone before bed.

Here's another rigorous study in a lab setting with similar conclusions: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6561503/

[luqtas]

seriously? the iphone study suggest that users stop "consuming" blue light 1 hour before sleep. they don't even control for other substances like coffee or alcohol intake or medication other than "sleep disorders"... your _robust_ ipad study has 12 people...

one of the links i posted is a meta-analysis on the subject that skimmed down ~ 130 studies down to 15 because bad metodology & conclude that blue light has effect on sleep quality