According to Dr. Jacques Vanderstraeten of the SHC, an excessive exposure to LED light can damage the retina and cause sleep problems. These risks are in the early morning and evening greatest:
“The light spectrum that emits LED lighting has a higher proportion of ‘blue light’ than natural sunlight. During the morning and evening the difference is greatest, so the effects of LEDs at those times are the strongest “.
Link (Dutch-language document)