Sleep physiology: practice question

A Physiology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Physiology · Sleep physiology

Sample item

What sleep stage is associated with slow-wave sleep?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

C. N3 sleep

N3 is the deepest non-REM stage and is characterized by slow-wave activity, high arousal threshold, and restorative sleep physiology.

Option by option

  • A. REM sleep

    REM sleep is associated with vivid dreaming and rapid eye movements.

  • B. Wakefulness

    Wakefulness is not a sleep stage.

  • C. N3 sleep (correct)

    Correct: N3 is slow-wave, deep non-REM sleep.

  • D. N1 sleep

    N1 is a light transitional stage of sleep onset.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Physiology question

What is the answer to this Physiology question?

The best answer is C, N3 sleep. N3 is the deepest non-REM stage and is characterized by slow-wave activity, high arousal threshold, and restorative sleep physiology.

Why is "REM sleep" not the answer?

REM sleep is associated with vivid dreaming and rapid eye movements.

Why is "Wakefulness" not the answer?

Wakefulness is not a sleep stage.

Why is "N1 sleep" not the answer?

N1 is a light transitional stage of sleep onset.

What concept does this question test?

It tests Sleep physiology in Physiology. The correct option holds because: Correct: N3 is slow-wave, deep non-REM sleep.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Sleep physiology?

For each system, sketch the key graph (pressure–volume loop, oxygen dissociation curve, nephron handling) and explain it aloud. Then use the flashcards and the other Physiology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.