Fast wave sleep, also known as heterogeneous sleep or rapid eye movement sleep. The EEG of this sleep stage is characterized by desynchronized fast waves. Various sensory and motor functions are further reduced. In addition, there may be intermittent paroxysmal manifestations, such as rapid eye movement, partial limb convulsions, increased heart rate, elevated blood pressure and accelerated breathing. At this time, it is easy to cause angina pectoris, asthma and obstructive emphysema.