Seasonal affective disorder, also known as seasonal depression, causes depressive symptoms during only certain times of the year... and there's a pattern to it?!
it's said that reduced exposure to 
sunlight throws off that balance.
dass der geringere Kontakt mit Sonnenlicht,
die innerliche Balance zerstört.
el causante es una exposición 
reducida a la luz solar.
el causante es una exposición 
reducida a la luz solar.
la diminution de l’irradiation solaire
ébranlerait l’équilibre de l’organisme.
si dice che la ridotta esposizione
 alla luce solare spezzi l'equilibrio.
a exposição reduzida à luz do sol acaba afetando.