It’s almost too easy.
First, make sure that you lie diagonally across the bed. Take up as much space as possible. Use your mighty paws to move the covers and pillows around until they are exactly to your liking (and taking up as much space as possible).
If your mama should question you, first keep your eyes closed and pretend you cannot hear her. Then slowly open one eye if she waits. A deep sigh may help at this time.
And then, if you need the big guns, bust out this:
No human can resist. Sleep well, my friends…