Behaviorally Assessed Sleep and Susceptibility to the Common Cold

Area of Science:

• Sleep Medicine
• Immunology
• Epidemiology

Background:

• Short sleep duration and poor sleep continuity are linked to increased susceptibility to infectious diseases.
• Previous research relied on subjective sleep measures, prone to recall bias.
• Objective behavioral sleep measurement is needed to accurately assess sleep's impact on illness.

Purpose of the Study:

• To determine if objectively measured sleep duration predicts common cold incidence.
• To investigate the association between sleep continuity and cold susceptibility.
• To utilize wrist actigraphy for precise sleep assessment before viral challenge.

Main Methods:

• 164 healthy adults (18-55 years) underwent 7 days of wrist actigraphy and sleep diary monitoring.
• Participants were experimentally exposed to rhinovirus and monitored for cold development over 5 days.
• Logistic regression analyzed the relationship between sleep duration, continuity, and cold incidence.

Main Results:

• Actigraphy-assessed shorter sleep duration was significantly associated with increased cold incidence.
• Individuals sleeping < 5 hours (OR=4.50) or 5-6 hours (OR=4.24) had higher odds of developing a cold compared to those sleeping > 7 hours.
• Sleep fragmentation and other sleep variables did not predict cold susceptibility.

Conclusions:

• Objective measurement of shorter sleep duration prior to viral exposure is a significant predictor of common cold susceptibility.
• Behavioral sleep assessment via actigraphy provides a reliable method for understanding sleep's role in infectious illness.
• Maintaining adequate sleep duration is crucial for immune defense against common respiratory viruses.