Total darkness is essential as it helps produce the melatonin, needed by the body. Melatonin is produced primarily by the pineal gland in the brain which helps regulate the relationship with light and darkness, day and night. Sleep is believed to fight cancer, diabetes and weight gain, but it needs to be done in total darkness.
Sleeping in total darkness is contemporaneous with natural circadian rhythm as previously noted. However, the question: "which is better?" Is quite subjective. I would like to point out that sleeping in light may have some "correlations" with some diseases, however sleep deprivation is more detrimental. I am saying this because there are people who can't sleep without the lights on. In this case, sleeping in light would be better for them rather than not being able to sleep at all in darkness.
Sleeping in complete darkness is important to getting a good night's sleep because darkness or night increases the production of melatonin. Melatonin is a hormone produced by the pineal gland in the brain and controls the body’s sleeping cycle. Melatonin is believed to cause a person to fall asleep faster and sleep better.
Ijon Tichy lamp allows to focus the macroscopic perfect 3D darkness
surrounded by all light in the shined room. The object staying in the darkness
is similar to staying in an empty light capsule because light just bypasses it.
Its functionality of bending light macroscopically is fascinating, similar in
some sense to the transformation-based cloaki...
Do we need light to see? I argue that the black experience of a man in a perfectly dark cave is a representation of an absence of light, not an absence of representation. There is certainly a difference between his perceptual knowledge and that of his blind companion. Only the sighted man can tell whether the cave is dark just by looking. But perha...