Which two phases make up normal sleep?
a. Hypnagogic and hypnopompic
b. Rapid eye movement (REM) and non REM
c. Alpha and beta
d. Delta and theta
ANS: B
Normal sleep can be divided into two phases, REM and non REM. Hypnagogic is the state between waking and sleeping; hypnopompic is the transition between sleeping and waking states. Beta waves are those associated with day to day wakefulness. During periods of relaxation while still awake, our brain waves become slower, increase in amplitude, and become more synchronous. These types of waves are called alpha waves. The first stage of sleep is characterized by theta waves. During a normal night's sleep, a sleeper passes from the theta waves of stages 1 and 2 to the delta waves of stages 3 and 4. Delta waves are the slowest and highest amplitude brain waves.
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