Mild hypoxia does not suppress auditory arousal from NREM sleep
Related Experiment Video
Updated: Aug 7, 2026

Quantifying Infra-slow Dynamics of Spectral Power and Heart Rate in Sleeping Mice
Published on: August 2, 2017
Peter G Catcheside1, R Stan Orr, Siau Chien Chiong
1Adelaide Institute for Sleep Health, Repatriation General Hospital, Daws Road, Daw Park, SA 5041, Australia. peter.catcheside@rgh.sa.gov.au
Study Objectives:
The depressive effects of hypoxia on the central nervous system are well known. The purpose of this study was to determine the influence of mild overnight hypoxia on the ability of healthy individuals to arouse from non-rapid-eye-movement (NREM) sleep to auditory tones.
Design:
Randomized cross-over.
Setting:
Participants slept in a sound-insulated room with the physiologic recordings and experimental interventions controlled from a separate room.
Participants:
Eleven healthy men aged 18 to 24 years.
Interventions:
On separate nights, participants were exposed to mild overnight hypoxia (SaO2 approximately 90%) or medical air in single-blind fashion. During established sleep, subjects were administered 1 of 10 auditory tones (500 Hz, 54-90 dB, 5 seconds duration) via earphones, or a sham tone (recording period with no tone).
Measurements And Results:
The probability and intensity of arousal responses in the 30 seconds following tones or shams were compared between gas conditions and between stage 2 and slow-wave sleep. Arousal probability and intensity increased with tone intensity and were significantly lower during slow-wave compared with stage 2 sleep but were not different between hypoxia and normoxia nights.
Conclusion:
These data suggest that mild overnight hypoxia does not impair the neural mechanisms involved in arousal from sleep to auditory stimuli.
Related Concept Videos
Sleep-Wake Cycles
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
REM Sleep Behavior Disorder
RBD is significantly associated with...
Hypoxia
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Optimal Arousal Theory
Inverted U-Shaped Performance Curve
The...
Stages of Sleep
Before sleep begins, in wakefulness, the brain exhibits primarily beta waves, which are high in frequency and low in amplitude, indicating alertness...
Respiratory Assessment: Purpose and Indications
Objectives and Importance:
The primary goal of respiratory assessment is to evaluate patients at early risk of clinical deterioration. Since respiratory distress often precedes other signs of declining health, breathing patterns and sounds become a...

