A state of behavioural or physiological activation.
Term to describe physiological activation, such as increased brain activity, autonomic responses, sweating, or muscle tension. go to glossary index
An abrupt change from a "deep" stage of NREM sleep to a "lighter" stage, or from REMS to awake, with the possibility of awakening as the final outcome. Arousal may be accompanied by increased tonic EMG activity and heart rate, as well as body movements.