What about the effects of daytime sunlight on sleep? (I would be hesitant about confounding sunlight exposure with vitamin D supplementation, I think it’s unlikely that they’re equivalent.)
Being outside daytime and keeping the bedroom area for nighttime use are both known to be helpful which is why they are part of CBT sleep hygiene.
You’re right that it’s not linked to vitamin D, which is via the skin not the eye/pineal/melatonin circuit.
What about the effects of daytime sunlight on sleep? (I would be hesitant about confounding sunlight exposure with vitamin D supplementation, I think it’s unlikely that they’re equivalent.)
Being outside daytime and keeping the bedroom area for nighttime use are both known to be helpful which is why they are part of CBT sleep hygiene.
You’re right that it’s not linked to vitamin D, which is via the skin not the eye/pineal/melatonin circuit.