Extending Sleep Improves Sleep and Stress Measures With Limited Microbiome Shift

Area of Science:

• Sleep science
• Gut microbiome research
• Psychoneuroimmunology

Background:

• Poor sleep quality and duration are linked to negative health outcomes.
• Experimental sleep extension may offer remediation, but underlying mechanisms are unclear.
• The gut microbiome's role in sleep physiology, potentially through inflammatory pathways, is an emerging area of research.

Purpose of the Study:

• To investigate if a 2-week sleep extension intervention improves sleep, reduces stress and inflammation, and alters gut microbiome composition in healthy adults.
• To explore the psychological, physiological, and microbial changes associated with increased sleep duration.

Main Methods:

• A pilot study involving healthy female adults with a 2-week baseline followed by a 2-week sleep extension.
• Assessments included actigraphy, subjective sleep quality, perceived stress, salivary cortisol, interleukin-6 (IL-6), and gut microbiome profiling.
• Data were analyzed pre- and post-intervention.

Main Results:

• Sleep extension significantly increased total sleep time and time in bed, improving subjective sleep quality and reducing perceived stress.
• No significant changes were observed in cortisol or IL-6 levels.
• Gut microbiome analysis revealed an increased abundance of Peptostreptococcus, a genus associated with anti-inflammatory metabolite production.

Conclusions:

• Sleep extension can lead to significant psychological benefits, including reduced stress and improved sleep quality.
• The intervention positively impacted the gut microbiome, increasing bacteria linked to anti-inflammatory properties.
• Findings support sleep extension as a viable intervention for improving stress-related health outcomes and highlight the gut microbiome's role.