middle of the night, wake them up (2am) get them to wear their no.
4
then, bring them to sea side. get all of them to get into the
water,til water reach their knee level (still facing sea) and ask
them, .... SLEEPY????
order them to lay down (sleeping position)..... facing sky and sing
some song for you 
by doing this, as the water was around knee level, and their head
cant completely lay on the beach, as water will cover their whole
face! therefor, they have to rasie their upper body, and the best
part is, when they are tired, they cant rest as well, as sea water
will get into their nose and mouth.
after 1 hour of having fun there. you will have part 2 for
them.
bring all of them to the air con room, get all of them stand in
front the air con... let the air con brow at them.... and until
their no 4 til was DRY then u let them go back to sleep
by then... it should be around 430am.... and their waky waky will
be at 5am
... you can carry on for part 3 and part 4 from there
