Trial results for a study investigating metabolic effects of sleep extension in people with obesity were posted on ClinicalTrials.gov on 2025-12-11. The study observed an increase in insulin sensitivity by 0.9 µmol/kgFFM/min in the sleep extension group.
Background
Obesity is a complex condition often associated with insulin resistance, a key factor in the development of type 2 diabetes and other metabolic disorders. Improving insulin sensitivity is a critical goal in managing these conditions. Lifestyle interventions, including diet and exercise, are foundational, but the role of sleep duration in metabolic health, particularly in individuals with obesity, is an area of ongoing research. This study explored whether extending sleep could offer a non-pharmacological approach to improve metabolic parameters.
Trial design
This completed study, titled "Metabolic Effects of Sleep Extension in People With Obesity," enrolled 31 participants. The trial focused on individuals with Insulin Resistance and Obesity. Participants were divided into two groups: a sleep extension group (n=15) instructed to increase their time-in-bed to achieve more than 7 hours of sleep per night, and a control group (n=15) instructed to maintain their current sleep habits. The study aimed to determine the impact of extending sleep duration on glucose metabolism.
Key results
The study reported on several key metabolic measurements:
- Insulin Sensitivity:
- Control group: MEAN -3.8 µmol/kgFFM/min.
- Sleep Extension group: MEAN 0.9 µmol/kgFFM/min.
- Hepatic Insulin Sensitivity Index:
- Control group: MEAN 0.4 1000/[(µIU/mL) * (µmol/kg FFM/min)].
- Sleep Extension group: MEAN -0.3 1000/[(µIU/mL) * (µmol/kg FFM/min)].
- Adipose Tissue Insulin Sensitivity Index:
- Control group: MEAN 2.4 1000/[(µIU/mL) * (µmol/kg FFM/min)].
- Sleep Extension group: MEAN -2.0 1000/[(µIU/mL) * (µmol/kg FFM/min)].
- Homeostatic Model Assessment of Insulin Resistance:
- Control group: MEAN 0.2 22.5/(µU/mL * mmol/L).
- Sleep Extension group: MEAN 0.3 22.5/(µU/mL * mmol/L).
- 24 Hour Glucose Area Under the Concentration Curve:
- Control group: MEAN 45 mg/dL x 24 h.
- Sleep Extension group: MEAN 41 mg/dL x 24 h.
- 24 Hour Insulin Area Under the Concentration Curve:
- Control group: MEAN 1 mU/L x 24 h.
- Sleep Extension group: MEAN -44 mU/L x 24 h.
What this means
The results suggest that extending sleep duration in individuals with obesity may have a positive impact on overall insulin sensitivity, with the sleep extension group showing a mean increase of 0.9 µmol/kgFFM/min compared to a mean decrease of -3.8 µmol/kgFFM/min in the control group. However, other metabolic markers presented a more varied picture. The Hepatic Insulin Sensitivity Index and Adipose Tissue Insulin Sensitivity Index showed decreases in the sleep extension group, while the Homeostatic Model Assessment of Insulin Resistance slightly increased. The 24-hour glucose AUC was lower in the sleep extension group (41 vs 45 mg/dL x 24 h), and 24-hour insulin AUC decreased in the sleep extension group (-44 vs 1 mU/L x 24 h). These findings indicate that while sleep extension might improve some aspects of glucose metabolism, its overall impact on insulin resistance and related markers requires further investigation to understand the full clinical implications for patients with obesity.
Source
The information for these trial results was obtained from ClinicalTrials.gov, a public database of clinical studies. The results for the study NCT03594994, titled "Metabolic Effects of Sleep Extension in People With Obesity", were posted on 2025-12-11 on clinicaltrials.gov.