I see no reason this topic deserves to be closed. 
Yes I agreed, the sleeping times are more difficult to practise
mindfulness and it is easy to slip into the 'alaya scenes'. But it
is also very important because there is a saying - it is harder to
practise in life than in (sitting) meditation, more difficult to
practise in sleep than in life, and even more difficult
when death is approaching. Not exact words but
something like that. So if we want to conquer death, we also need
to conquer death in sleep. My shi fu taught us certain dharmas that
are suitable to be practised during sleep, but it is inappropriate
for me to discuss them here. Also 'wu wei fa' doesnt need to be
'cultivated' but only 'sustained' (chi2) - don't need xiu1, only
chi2. But my practise is really lousy, so pai seh, I dont have such
'sleeping experience' 
Maybe at a more advanced level...
But I can share what I learnt from others I heard. I have a young
friend from my dharma centre however, his cultivation is quite
strong and I believe has awakening experiences recently as he
hinted in his essays (diary rather - he writes diary entries on his
daily practise in living/meditation) and some of them which my
teacher asked to be published on magazine. I requested to read some
of them. I'll copy a bit here on his experience of Sleeping.
Another thing is my dharma teacher mentioned before she could
remain lucid throughout her sleep, and she says 'it may be because
of her meditation-before-sleep habits'. My shi fu and dharma
teacher also mentioned, meditation will allow one to rest very well
and be very awake the next day. If we look at the Chinese words
'Shui Jiao', the 'Jiao' is the same as 'Jue', so we should 'Jue
Shui', 'mindful sleeping' 
In this way
we will be very awake the next day.
One of our ex-moderator, Namelessness who no longer comes to the
forum... who is also highly realised... bcos of his practise he can
sleep very little yet isnt tired. He can go 4 days without
sleeping, although he does sleep everyday la (a few hours)...
as due to his busy schedule etc maybe he needs more
rest.
Shakyamuni Buddha is known to sleep only one hour per
day. I believe it is because of his 'mindful sleeping' and
his meditation. Sometimes a little meditation can equate to lots of
sleep.
