Valentine,
  So sorry to hear your troubles. I remember nights my mom would not go
to sleep for anything.Luckily she can not get out of her bed alone.But
she lays in there yelling.Nights like that can test your patience for
sure.And I would lose mine.Do you have help?Someone to let you sleep
during the day?Then theres those days they just won't sit still.So you
follow them around all day so they don't fall.Hang in there,Barb

Just a question as well - is he napping during the day or sleeping
late? If so, you might need to try and discourage both - keep him on
regular hours and moving around as much as you can during the day, so
he's more tired at bedtime. If he absolutely HAS to have a nap, make it
early in the afternoon and keep it short - no different than you would
a small child who won't stay down at night.

When my MIL finally had to go into an Alzheimer's unit, they had no TVs
permitted on the unit at all, and one of the reasons was the sleep
consequences of residents having them.  The staff would bring one in
every now and then for movie evenings, but they found when residents
had TVs, they'd isolate themselves, stay up too late, half snooze half
the day in front of them so they were inactive or worse, napping
excessively - and then be up all night. Residents would also  see
things on the tube, misinterpret them or develop delusions around them,
and then be all agitated as a consequence - my mother in laws
particular "thing" developed early in her Alzheimer's - an unshakable
belief that people on TV could see her and talk to her (and believe me,
she didn't want most of them to do either, so it led to all kinds of
difficult behaviours).

Mary