Sleep

         Lots more of this innate, biological function (cycle) (rhythm) known to all, is happening among my "now a days". Say what? Can you believe it? My Guyton medical school "Physiology" text (front cover shown) states on page 659,

 "Sleep is defined as unconsciousness from which the person can be aroused by sensory or other stimuli."

        Hum ... sensory or other brain activity it is? States of brain activity ... wakefulness , extreme excitement, different levels of mood, and so on it would go ... activating forces it would seem. Well, have to dig a little more into the activating!