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CPL » Human Factors » Sleep and Fatigue (Alertness management)

34.40 Sleep and Fatigue (Alertness Management)

34.40.2 Describe the stages of sleep.

Normal sleep consists of two main types:

  • non-rapid eye movement (NREM) sleep; and

  • rapid eye movement (REM) sleep.

 

During a normal night's sleep, a person progresses through the stages of NREM sleep before entering REM sleep.

 

Stage 1 — Light sleep

Stage 1 is the transition between wakefulness and sleep.

It normally lasts only a few minutes.

During this stage:

  • the person begins to relax;

  • breathing and pulse remain relatively regular;

  • fleeting thoughts or images may occur; and

  • the person can be awakened easily.

 

If awakened, the person may believe they had not yet been asleep.

 

Stage 2 — True sleep

Stage 2 is a period of light sleep, but the person is now definitely asleep.

During this stage:

  • the body becomes more relaxed;

  • awareness of the surroundings decreases;

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