Differences in cellular pathway activity flip the switch from nocturnality to diurnality and explain a major evolutionary change humans have undergone.
Early mammals were nocturnal, sleeping during the day while large predators were active. However, after the extinction of dinosaurs, several different lineages of mammals independently transitioned to become active during the day. Exactly how this dramatic change occurred has proved elusive. A new study, published in the journal Science, has revealed a cellular switch which holds the answer.
Not nocturnal? Speak for yourself, maybe… :p
I’d say it still counts as diurnal, unless you’re actually sitting completely in the dark (and yes, the screen counts as a light source) Ü
Also, as someone who also is awake most nights, I get the impression that it’s not particular healthy, i.e. is in conflict with our biology.