"Disease exists, if either sleep or watchfulness be excessive" (Hippocrates, Aphorism LXXI, from a worthwhile article on sleep disturbance in The Lancet 2004; 364: 1959-1973). I had mentioned in a previous column that not feeling well in the morning was a sign that all things might not be well with your body, and have been asked to expand on this. Our bodies are wonderful machines that replenish the system during our down time: sleep. Sleep mode (a very poorly understood phenomenon that we...

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