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Yup. Blue light was/is a recent fad "cure" for sleep issues. The impacts are negligible outside test centers. I have a red-light setting on my phone for 10pm. In practice it is nothing more than a silent alarm that tells me to stop watching youtube.

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It feels to me like humans need darkness more than other animals to sleep. I'm curious if this another excuse rather than a real issue.

I suspect darkness works, but only because it mitigates circadian rhythm issues somewhere else.

I fall asleep easier with an eye mask on (and sometimes can't without it), but also feel like I dream more without it, and no dream sleep isn't as mentally refreshing.

I do have some sleep stage measuring gadgets to actually test this, but sleeping with an EEG headband on isn't the most comfortable thing.

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