BRPT Sleep Physiology and Neuroanatomy 2

Question 1

According to AASM criteria, delta waves associated with N3 sleep are defined as having a frequency of:

Accepted Answer

0.5–4 Hz

Answer

Delta waves are 0.5–4 Hz, high-amplitude (>75 µV in frontal derivations) waves that must constitute at least 20% of an epoch to score N3.

Question 2

In the two-process model of sleep regulation, which process represents the homeostatic sleep drive that accumulates during wakefulness via adenosine buildup?

Accepted Answer

Process S

Answer

Process S (homeostatic sleep pressure) rises during wakefulness as adenosine accumulates and dissipates during sleep as adenosine is cleared.

Question 3

Sawtooth waves seen during REM sleep are best described as:

Accepted Answer

2–6 Hz triangular or notched waves maximal in central leads

Answer

Sawtooth waves are 2–6 Hz sharply contoured or triangular waves with a notched appearance, typically most prominent over central derivations during REM sleep.

Question 4

Approximately what percentage of total sleep time is typically spent in REM sleep in healthy adults?

Accepted Answer

20–25%

Answer

Healthy adults spend roughly 20–25% of total sleep time in REM sleep, with the proportion increasing across successive cycles.

Question 5

REM sleep atonia (muscle paralysis) is primarily mediated by which neurotransmitters acting on spinal motor neurons?

Accepted Answer

Glycine and GABA

Answer

Brainstem REM-on circuits hyperpolarize spinal motor neurons via glycine and GABA, preventing the enactment of dream content.

BRPT - Board of Registered Polysomnographic Technologists Practice Test

BRPT - Board of Registered Polysomnographic Technologists Practice Test

BRPT Sleep Physiology and Neuroanatomy 2