There's a time of day that seems to have a peculiar effect on the lives of many folks over 60 - 3:00 in the morning.  It doesn't matter if they went to bed early or late, if they were tired or at ease, it's as if an invisible alarm clock goes off inside them at the very same instant.  Many wake up for no apparent reason, glance at the clock and there it is, 3:00 a.m.  This pattern has intrigued not only doctors but also scholars of broader subjects concerning the mind, body a