Saw a good movie this weekend called 'HEROES' . [good thing the lighting was low in the theatre or the others might have questioned my masculinity[machismo] ME cry NEVER! [ It also adds fuel'in my mind]'to the forecast that China WILL surpass the U.S.A as the supreme economic power in the world in the near future.] Checked out an openair [free] concert in the heart of 'skidrow Vancouver' but it failed to impress.[wasnt worth the price of the wrapper let alone a blank]So instead I took a stroll down the 'crack alleys' To only get dragged down even more! What circumstances lead them to become slaves to their addictions and to spiral into that abyss where lifes daily ritual is to satisfy their craving and stop the hurt. Ive lost friends down in those rat infested alleys, shooting galleries and cockroach riddled hotel rooms. And it hurts. But I keep getting drawn back as if their spirits wont let me forget ,as I swell with emotion waiting for the tears to relieve the anguish. It feels good to cry sometimes! 
i've never heard of the bio-rhythms... well, i take it back... i've heard of them, but no one's ever taken the time to explain anything about them to me... but that's eerie... what you said about feeling on top of the world and suddenly not even wanting to get up...
i feel like that a lot.
i always just thought i was a depressed sociopath.
do you remember the name of the book you read?