Waking at night is also a sx of menopause.  I figure the night cycle goes
like this..new hubby, lots of fun in the night, new baby, lots of feeding
in the night, babies...etc, teenagers..lots of waiting in the night,
menopause!  Each stage is just a prep for the next to keep us trained to
wake up at night.  Maybe sleeping straight thru is abnormal!  Sincerely,
Pat in SNJ