I have never been a morning person. I recently read an article describing the relaxing effect of birdsong on the human psyche. The reasoning is as follows:
Throughout human history we have used the sounds birds make as a warning. The idea is that if the birds are making noise then all is well; I can continue with my toolmaking, fire building, hunting, gathering, daily business. However if the birds stop their incessant squeaking then essentially something is up.
Birdsong for me however has the opposite effect. It makes me anxious, and annoyed. Now I get to wonder what pavlovian experiment my parents orchestrated to get that effect. Cheers.