Well, I have to admit that my two dogs sleep on the bed and used to do it all night long. But in the summer, it gets too warm. In the winter, it's great when they come up at 4am...but they are small dogs :D :D They like their beds which are under the nightstand and go there at the beg. of the night or when I whisper "Bed" :)
Large breeds, I really think, have to be brought up with the concept of "Start out how you mean to go on" --- kind of like a marriage :D :D Don't begin to iron socks unless you want to be ironing socks 10 years from now :)
Seriously, though, if you can't determine how to get your sweet 4 month old puppies to stay off your bed or out of your bedroom, it does not bode well for when they hit adolescence and do REALLY naughty stuff :rolleyes: ;) :) :D
good luck,
toodles