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A genetic basis for insomnia
It is connected to physical health (cardiac disorders) and unsurprisingly, mental health.
See:
https://www.scientificamerican.com/a...&sf209257415=1
I do think there's a sort of "situational" insomina, which most people might experience, i.e. before a big test or meeting, or big life event, which is caused by normal anxiety, although even then some people are probably more prone to it than others.
As a child and young girl, while I could never sleep easily during the day I would fall asleep at night as soon as my head hit the pillow. Life changes that for a lot of people.
Non si fa il proprio dovere perchè qualcuno ci dica grazie, lo si fa per principio, per se stessi, per la propria dignità . Oriana Fallaci