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Sleep Stages. Professor Ken Daley Department of Exercise and Sport Science. Two Major Types of Sleep. Non-REM (non-rapid eye movement) REM (rapid eye movement). Transition From Waking State. “beta waves” to “alpha waves” eyes moving spontaneously in a slow rolling eye movement.

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Sleep stages l.jpg

Sleep Stages

Professor Ken Daley

Department of Exercise and Sport Science

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Two Major Types of Sleep

  • Non-REM (non-rapid eye movement)

  • REM (rapid eye movement)

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Transition From Waking State

  • “beta waves” to “alpha waves”

  • eyes moving spontaneously in a slow rolling eye movement.

  • Their heart and respiratory rates vary depending on the individual.

  • The individual has spontaneous movements (i.e. changing positions to become comfortable).

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Non-REM (rapid eye movement)

  • most of the muscles relax, body systems take a rest, and the brain waves associated with wakefuleness and alertness disappear and are replaced by increasingly slow, deep waves of inactivity.

  • accounts for 70% of the total sleep time of a young adult

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4 stages of NREM sleep

  • STAGE 1:

    • takes 5-10 minutes

    • less aware of their surroundings

    • May waken by a whisper, or noise.

    • Are relaxed, breathing is more regular and there is more slow, rolling eye movement noticed.

    • May have "hypnogogic expriences" - dream-like sensations of falling, hearing voices, or seeing flashes of pictures.

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  • STAGE 2:

    • first stage of true sleep

    • 50% of total sleep

    • Stages 1&2 lasts about 30 minutes

    • Sleep spindles and K-complexes characterize this sleep stage.

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Sleep Spindles


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  • STAGE 3 and 4

    • very relaxed state with a slow, regular heartbeat and respiratory rate.

    • Their muscles are very relaxed.

    • It is very difficult to arouse a patient in “Slow Wave Sleep”.

    • If awakened, you are confused and slow to react.

    • It is normally easy to go back to sleep.

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REM (rapid eye movement) encourages growth.

  • eyes move in a rapid, flickering, twitching motion while their eyelids are closed.

  • The EMG leads are still as the patient is temporarily paralyzed during this stage. This temporary paralysis includes the respiratory muscles, except for the diaphragm.

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  • It is suggested that this paralysis is a clever device that lets the mind explore the realms of its subconscious, while preventing us from acting out dream events.

  • Blood flow to the brain is increased during this stage of sleep. In children, may help enable the brain to grow and in adults to repair itself.

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The EEG waveforms include minutes of sleep of falling asleep.

“sawtooth waves” and waveforms

that have sharp rapid "deflections"

(hence the term, Rapid Eye Movements).

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Have a good sleep minutes of sleep of falling asleep.

But Not In Class

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Source minutes of sleep of falling asleep.