There's a cloud cover and the humidity feels higher. The air is
   thicker and i feel "bigger". I think perhaps there is a
   low-pressure system that is causing my body to expand, retain a
   little more water, making me sluggish and everything heavy.

   It's not a dramatic difference, but it's noticeable. My arms
   don't want to leave the computer table even to have a sip of
   coffee.