Hey nigel i have some suggestions
first off the thing you will want to get your hands on is placebo's
sleep track (get the latest version somewhere here:
http://polynap.grelly.com/)
secondly i suggest great headphones... or pa speakers (but they arent
available to most people and your neighbors might get irritated).
its best to adapt with a friend! so try to find a friend who lives
close or in the same house as you and adapt together, however adapt to
out of phase schedules. so at least one of you is always awake and
able to wake the other.
then plan your adaptation with projects that can be accomplished
without too much brain work... re-organisation of your house may be
too much.... what about gardening? this was something i did heaps of
while i adapted...
you could also try making one or two of these
http://en.wikipedia.org/wiki/Geodesic_dome
tis good fun...(and possibly one of the reasons buckminster fuller was
a polyphaser...)
and lastly dont forget that you really do need to have stuff to do at
night. permanently.
if you are like me then you shouldnt have trouble doing this but some
people may get insanely bored with their extra 6 hours...