The five basic stages of sleep are further classified into two distinct orders characterized by

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The five basic stages of sleep are classified into two distinct orders, which are characterized by rapid eye movement (REM) and non-REM. The first four stages of sleep are non-REM, while the fifth stage is REM. The sleeper's breathing rates, body temperature, and ability to quickly respond to stimulus may vary throughout the different stages but are not the defining factor in determining the order.

The Five Basic Stages of Sleep Are Further Classified into Two