Responses to a general sense of comfort are demonstrated by a sense of ease before going into a peaceful period of sleep. Responses to discomfort are displayed by agitation.
The response to pain is a slow development of a sense of discomfort. The discomfort is usually caused by the mattress and their look of agitation or restlessness is noticed by others. Behaviour that supports an observation of sustained attention only occurs when the person is uncomfortable. The typical pattern is short periods of agitation that are repeated until the discomfort is removed.