10 ms·
more red signals sunset to the brain. Read in the HN comments that bunks in the navy are equipped with red lights so one person can read without disturbing the
by nkingsy 8y ago
more red signals sunset to the brain. Read in the HN comments that bunks in the navy are equipped with red lights so one person can read without disturbing the sleep of others.
- vram22 8y agoThanks, and will check those comments.