yea i doubt so too. i can sleep like 2 hours, 1 day then go to
work. next day 4 hours and 4 hours again and yet nothing
happened.
its the weather! and maybe cause i use my brain too
much..

weather causes headaches?
depends on what work you do. if i'm out on the field working,
gets tiring very easily. if work is deskbound and easy, stressfree,
you don't need that much concentration and energy.