ABDSM FINAL EXAM DENTAL SLEEP MEDICINE ACTUAL
2026 /2027 EXAM TEST BANK PRACTICE QUESTIONS AND
STUDY GUIDE COMPLETE ACCURATE EXAM REAL
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES (100% CORRECT VERIFIED SOLUTIONS)
CURRENTLY UPDATED VERSION 2026 EDITION
|GUARANTEED PASS A+ |FULL REVISED EXAM |JUST
RELEASED
1. In Stage 1 nREM sleep, which of the following occurs?
A. The muscles relax and body temperature drops
B. The muscles do not relax and body temperature drops
C. The muscles relax and electrical activity in the brain increases
D. The muscles relax and delta waves start occurring
CORRECT ANSWER: A. The muscles relax and body
temperature drops
Rationale: Stage 1 nREM sleep is the transition from wakefulness to
sleep. During this stage, muscles begin to relax and body
temperature drops. Electrical activity in the brain actually slows
down (theta waves appear), and delta waves are characteristic of
deeper Stage 3 sleep, not Stage 1.
,2. Normal adults spend approximately what percentage of sleep in
REM sleep?
A. 2-5%
B. 10-15%
C. 20-25%
D. 30-50%
CORRECT ANSWER: C. 20-25%
Rationale: In normal adults, REM sleep accounts for approximately
20-25% of total sleep time. REM sleep typically begins about 90
minutes after sleep onset and cycles throughout the night, with
longer REM periods occurring in the second half of the night.
3. Which neurotransmitter is primarily responsible for promoting
wakefulness?
A. GABA
B. Serotonin
C. Orexin (Hypocretin)
D. Melatonin
CORRECT ANSWER: C. Orexin (Hypocretin)
,Rationale: Orexin (hypocretin) is a neuropeptide produced in the
lateral hypothalamus that plays a critical role in promoting and
maintaining wakefulness. Deficiency in orexin signaling is associated
with narcolepsy. GABA promotes sleep, serotonin has complex
sleep-wake effects, and melatonin regulates circadian timing.
4. The suprachiasmatic nucleus (SCN) is primarily responsible for:
A. REM sleep generation
B. Circadian rhythm regulation
C. Muscle atonia during REM
D. Respiratory drive during sleep
CORRECT ANSWER: B. Circadian rhythm regulation
Rationale: The suprachiasmatic nucleus (SCN) located in the
anterior hypothalamus serves as the body's master circadian
pacemaker. It receives direct input from the retina and coordinates
daily rhythms in sleep-wake cycles, hormone secretion, and body
temperature. REM generation involves the pons, and muscle atonia
involves REM-off and REM-on areas.
5. Which EEG waveform is characteristic of Stage 3 nREM sleep?
A. Alpha waves
, B. Theta waves
C. Delta waves
D. Sleep spindles
CORRECT ANSWER: C. Delta waves
Rationale: Stage 3 nREM sleep (slow-wave sleep) is characterized by
high-amplitude, low-frequency delta waves (0.5-2 Hz). Alpha waves
are associated with relaxed wakefulness, theta waves with Stage 1
sleep, and sleep spindles with Stage 2 sleep.
6. Reviewing your patient's diagnostic polysomnogram, you note
more than a 50% epoch consists of alpha waves. According to the
current PSG scoring guidelines, the patient is in which stage of sleep?
A. Stage I NREM
B. Stage II NREM
C. Stage III NREM
D. Stage REM
CORRECT ANSWER: A. Stage I NREM
Rationale: Alpha waves are characteristic of relaxed wakefulness and
Stage I NREM sleep. When more than 50% of an epoch consists of
2026 /2027 EXAM TEST BANK PRACTICE QUESTIONS AND
STUDY GUIDE COMPLETE ACCURATE EXAM REAL
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES (100% CORRECT VERIFIED SOLUTIONS)
CURRENTLY UPDATED VERSION 2026 EDITION
|GUARANTEED PASS A+ |FULL REVISED EXAM |JUST
RELEASED
1. In Stage 1 nREM sleep, which of the following occurs?
A. The muscles relax and body temperature drops
B. The muscles do not relax and body temperature drops
C. The muscles relax and electrical activity in the brain increases
D. The muscles relax and delta waves start occurring
CORRECT ANSWER: A. The muscles relax and body
temperature drops
Rationale: Stage 1 nREM sleep is the transition from wakefulness to
sleep. During this stage, muscles begin to relax and body
temperature drops. Electrical activity in the brain actually slows
down (theta waves appear), and delta waves are characteristic of
deeper Stage 3 sleep, not Stage 1.
,2. Normal adults spend approximately what percentage of sleep in
REM sleep?
A. 2-5%
B. 10-15%
C. 20-25%
D. 30-50%
CORRECT ANSWER: C. 20-25%
Rationale: In normal adults, REM sleep accounts for approximately
20-25% of total sleep time. REM sleep typically begins about 90
minutes after sleep onset and cycles throughout the night, with
longer REM periods occurring in the second half of the night.
3. Which neurotransmitter is primarily responsible for promoting
wakefulness?
A. GABA
B. Serotonin
C. Orexin (Hypocretin)
D. Melatonin
CORRECT ANSWER: C. Orexin (Hypocretin)
,Rationale: Orexin (hypocretin) is a neuropeptide produced in the
lateral hypothalamus that plays a critical role in promoting and
maintaining wakefulness. Deficiency in orexin signaling is associated
with narcolepsy. GABA promotes sleep, serotonin has complex
sleep-wake effects, and melatonin regulates circadian timing.
4. The suprachiasmatic nucleus (SCN) is primarily responsible for:
A. REM sleep generation
B. Circadian rhythm regulation
C. Muscle atonia during REM
D. Respiratory drive during sleep
CORRECT ANSWER: B. Circadian rhythm regulation
Rationale: The suprachiasmatic nucleus (SCN) located in the
anterior hypothalamus serves as the body's master circadian
pacemaker. It receives direct input from the retina and coordinates
daily rhythms in sleep-wake cycles, hormone secretion, and body
temperature. REM generation involves the pons, and muscle atonia
involves REM-off and REM-on areas.
5. Which EEG waveform is characteristic of Stage 3 nREM sleep?
A. Alpha waves
, B. Theta waves
C. Delta waves
D. Sleep spindles
CORRECT ANSWER: C. Delta waves
Rationale: Stage 3 nREM sleep (slow-wave sleep) is characterized by
high-amplitude, low-frequency delta waves (0.5-2 Hz). Alpha waves
are associated with relaxed wakefulness, theta waves with Stage 1
sleep, and sleep spindles with Stage 2 sleep.
6. Reviewing your patient's diagnostic polysomnogram, you note
more than a 50% epoch consists of alpha waves. According to the
current PSG scoring guidelines, the patient is in which stage of sleep?
A. Stage I NREM
B. Stage II NREM
C. Stage III NREM
D. Stage REM
CORRECT ANSWER: A. Stage I NREM
Rationale: Alpha waves are characteristic of relaxed wakefulness and
Stage I NREM sleep. When more than 50% of an epoch consists of
