Cerebral perfusion differences between drowsy and nondrowsy individuals after acute sleep restriction

Area of Science:

• Neuroscience
• Sleep Science
• Medical Imaging

Background:

• Acute sleep restriction is a common issue with potential cognitive consequences.
• Cerebral blood flow (CBF) is a critical indicator of brain function.
• Drowsiness is a primary symptom of sleep deprivation.

Purpose of the Study:

• To investigate alterations in resting cerebral blood flow (CBF) following acute sleep restriction.
• To determine the relationship between CBF changes and drowsiness levels, assessed via eye-video monitoring.

Main Methods:

• Utilized arterial spin labeling (ASL) perfusion imaging in a 3-Tesla MRI scanner.
• Scanned 20 healthy adults after both a sleep-restricted (4 hours time in bed) and a rested night.
• Assessed visual signs of drowsiness during the MRI scan using eye-video recordings.

Main Results:

• Overall reduction in CBF observed in the right-lateralized fronto-parietal attentional network post-sleep restriction.
• This reduction was primarily driven by participants exhibiting significant drowsiness.
• Increased CBF in basal forebrain and cingulate cortex noted in non-drowsy participants.

Conclusions:

• Cerebral activity patterns after sleep restriction are strongly influenced by an individual's level of drowsiness.
• Non-drowsy individuals can sustain or enhance activity in arousal and attentional brain regions.
• Drowsy individuals demonstrate reduced activity in both arousal-promoting and attentional brain areas.