white and black

[tllwd]

White nights and black days are here

Some people may have difficulty adjusting to the light-dark cycles, and so they can never get a decent night sleep and experience a sleep disorder, some people can get clinically depressed.
The researchers mentioned several other symptoms among people on polar expeditions such as memory impairment, anxiety, reduced alertness, headaches, boredom, fatigue, inattention to personal hygiene, intellectual inertia and over-eating.

From my personal observation people who grown up below the circle have more psychological problems during 3 months of constant light but not as bad when sun is 3 months down.

I wonder why.