Blue Light Can Cause Brain Damage and Aging (study summary)
Blue light exposed flies developed brain damage and locomotion disability. This probably can extrapolate to humans.
Sleep
Red Light During Sleep Reduces Sleepiness, But Not Melatonin (study summary)
Wearing a red light mask while sleeping led to greater alertness upon waking, and better self-reported feelings of being awake. Wearing red light goggles upon waking also reduced sleep inertia, but not as much as the mask.