It seems that seasonality and light conditions can affect bipolar-disorder. There is more depression when the days are shorter.
It seems that the manic component of bipolar disorder (even mild) can be affected by light. The brain senses light and darkness exclusively by light in the blue spectrum. Using blue blocker lenses (orange lenses) we can "fool" the brain and melatonin systems into "thinking" it is totally dark.
In a small study (Henriksen TE et al. Bipolar Disord 2016 May. ) researchers found that manic activity decreased significantly when users wore these glasses, and increased again when they were not used.
This could lead to another treatment for manic disorder. I also wonder if it might have some uses in jet lag or sleep disorders?
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