In humans the connection between light and biology is somewhat looser.
Does light make you happy.
Happy lights also known as light therapy lamps happy lamps and sad lights give you additional exposure to light when there s less sun in the fall and winter months.
The ultraviolet uv light releases happy hormones in the body so that when you wake up and the ultraviolet rays of the light that shines in you you feel happy.
And melatonin a hormone which promotes sleep.
Just like if it was a sunny day and you feel excited the effect is the same.
Rosenthal found that while not everyone is as strongly affected by a lack of sunlight for the people who are light boxes that blast a few minutes of bright light in the frequency of natural.
And as for sleep patterns while most people sleep at night and are active in the day there are plenty of people who reverse that to work the graveyard shift.