As a norn sleeps it is still receptive to certain stimuli, including loud noises, being slapped or tickled.

Norns also have a dream phase, when this happens they become unresponsive to all stimuli, and process their instincts. This means that the norn treats each instinct as a real-life experience and so learns from it. Each instinct takes approximately 5 seconds to process.

It is quite normal for a norn to move whilst sleeping, they might sit or stand, shift facing directions, even watch moving objects, although when this happens they will not process dreams.