AI Article Synopsis
- The study explores how light affects the human circadian system, focusing on the role of the sleep-wake system and the orexin hormone.
- A mathematical model was developed to analyze disturbances in circadian rhythms and how short bright light treatments can aid recovery.
- Results indicate that morning light treatment is more effective for stabilizing circadian rhythms across various conditions compared to evening light treatment.
Article Abstract
Background: While the effects of light as a zeitgeber are well known, the way the effects are modulated by features of the sleep-wake system still remains to be studied in detail.
Methods: A mathematical model for disturbance and recovery of the human circadian system is presented. The model combines a circadian oscillator and a sleep-wake switch that includes the effects of orexin. By means of simulations, we characterize the period-locking zone of the model, where a stable 24-hour circadian rhythm exists, and the occurrence of circadian disruption due to both insufficient light and imbalance in orexin. We also investigate how daily bright light treatments of short duration can recover the normal circadian rhythm.
Results: It is found that the system exhibits continuous phase advance/delay at lower/higher orexin levels. Bright light treatment simulations disclose two optimal time windows, corresponding to morning and evening light treatments. Among the two, the morning light treatment is found effective in a wider range of parameter values, with shorter recovery time.
Conclusions: This approach offers a systematic way to determine the conditions under which circadian disruption occurs, and to evaluate the effects of light treatment. In particular, it could potentially offer a way to optimize light treatments for patients with circadian disruption, e.g., sleep and mood disorders, in clinical settings.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5944165 | PMC |
| http://dx.doi.org/10.1186/s12976-018-0077-x | DOI Listing |
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