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Consciousness > Sleep Stages > Flashcards

Sleep Stages Flashcards

1
Q

What is stage 1?

A

Transition from Awake to asleep

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2
Q

How long does stage one last?

A

Matter of minutes

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3
Q

What are some characteristics of Stage 1 sleep?

A

People report feeling like they’re falling, hallucinations, feeling of floating. No memory of Stage 1 sleep.

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4
Q

What is stage 2 sleep?

A

Stage 2 is light sleep occupying 45-55% of total sleep time.

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5
Q

How long does stage 2 sleep last each time?

A

Around 20 minutes.

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6
Q

What are some characteristics of Stage 2 sleep?

A

k-complexes - negative high voltage peak of activity, sleep spindles, deeper relaxation

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7
Q

True or false - If you wake up during stage 2 sleep, you can’t go passed stage 2 for the remainder of the night.

A

True

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8
Q

What are sleep Spindles?

A

Brain activity after a muscle twitch during stage 2 sleep.

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9
Q

What is stage 3 sleep?

A

Deep sleep

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10
Q

What are some characteristics of Stage 3 sleep?

A

More relaxed, muscles become paralysed, slow delta waves.

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11
Q

In what stage of sleep do night terrors, sleep walking etc. occur?

A

Stage 3.

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12
Q

What is stage 4 sleep?

A

Deepest sleep

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13
Q

What are some characteristics of stage 4 sleep?

A

Hard to wake up, wake up groggy/confused, stage 4 time decreases with age.

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14
Q

What is stage 5 sleep?

A

REM sleep

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15
Q

What does REM and NREM stand for?

A

REM: Rapid Eye Movements
NREM: Non-Rapid Eye Movements

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16
Q

How long does REM sleep last?

A

10 minutes

17
Q

How much time of sleep does REM take up?

A

20-25% of total sleep time

18
Q

What are some characteristics of REM sleep?

A

Most memorable dreams, no muscle use, HR accelerates, rapid/irregular breathing, eyes dart in 30 sec bursts, twitching, hard to wake, paradoxical (internal activity but externally calm).

19
Q

In what stage of sleep does the brainstem block messages?

A

REM sleep

Consciousness (7 decks)

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