Pretty much every night

The fifth one is thinking about the inevitability of death.

http://4.bp.blogspot.com/_W80ObqO3YRw/TBKgvyh08TI/AAAAAAAAGz4/15hBD2IaQNk/s1600/X-RAY+KNEES+SIDE+VIEW.JPG
they do

I used to work with penguins at an aquarium and this was one of the most common questions we got like people were so relievedto find the answer is yes

My brain is divided into 6
1/6 trying to sleep
1/6 thinking something philosophical
1/6 thinking about Pokémon
1/6 worrying about my future
1/6 crying over sadness
1/6 was doing something that I can't even figure out