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?!
but neurotransmitters such as melatonin 
are known to be influenced by sunlight.
Aber es ist bekannt, dass Neurotransmitter wie
Melatonin vom Sonnenlicht beeinflusst werden.
pero los neurotransmisores como la 
melatonina se ven afectados por la luz solar.
pero los neurotransmisores como la 
melatonina se ven afectados por la luz solar.
On dit que les neurotransmetteurs
telle que la mélatonine
ma i neurotrasmettitori come la melatonina
 sono influenzati dalla luce solare.
mas neurotransmissores como melatonina 
são influenciados pela luz do sol.