They must dream surely all that twitching and grumps and growls must be a reaction to something going on in their heads

my three now dont dream that much, but my golden retriever was aways wimpering, making noises, growlig, tail wagging - most nights and she had a lovely life from 7 weeks odl when we first got her - i think if youre really worried gently wake em up, but I wouldnt worry too much