Sleep is critical to a wide range of biological functions. Inadequate sleep results in impaired cognitive performance and mood, and adverse health outcomes including obesity, diabetes, and cardiovascular disease. Recent evidence suggests that sleep behaviors can spread between individuals connected by a social network and that these behaviors can even influence drug use in teenagers. While models exist separately for quantifying connectivity within social networks and for modeling sleep, there are currently no combined models for predicting and studying the emergent dynamics of sleep behaviors within social networks. We therefore propose to develop multi-scale physiologically-based models of the effects of social interactions on sleep behaviors. We have assembled a trans-disciplinary team of individuals who have: (i) developed mathematical methods for quantifying social network interactions; (ii) developed a physiologically based model of sleep and circadian physiology, including the effects of wake-promoting stimuli and drugs; (iii) studied healthy and pathological sleep behaviors under inpatient and outpatient conditions, including in undergraduate students; (iv) developed techniques for collecting multiple physiological and behavioral variables; and (v) studied pattern recognition and signal processing techniques for analyzing multimodal data. We will develop statistical and mathematical models from experimental data collected from 8 groups of closely-connected MIT undergraduates using mobile phones and wearable sensors to measure sleep patterns and duration, light exposure, subjective measures of sleepiness and mood, and social interactions including texting, calls, internet use, and spatial proximity to other participants. We will determine how social interactions, sleep duration and timing, light exposure, sleepiness and mood interact. These social interaction effects will then be added to our physiological sleep and circadian model, which will also be extended from the individual to the population level, while the physiological model results will inform the social network model work. Once developed, the mathematical model will be used to explore how emergent dynamics depend on network properties. Specifically, we will simulate the student network, including the observed rates and effects of social interactions. We will then test the effects of modifying the network properties, including the strengths of interactions and the degree of population heterogeneity (model parameter variability). We anticipate that the mathematical model developed in this project will provide a new means of predicting the dynamics of sleep behaviors within social networks. Due to its multi-scale nature, the model will relate observations at the network level to interactions between individuals. This will allow us to simulate candidate strategies for intervening in populations wit unhealthy sleep behaviors. Given the alarming increase in insufficient sleep in the U.S., and the rapidly escalating use of social media, establishing models that can be used to improve sleep behaviors could potentially improve multiple health outcomes.

Public Health Relevance

Healthy and unhealthy sleep behaviors can be transmitted by social interactions between individuals within social networks. Using multimodal data collected from 8 cohorts of MIT undergraduates, we will develop the first statistical and multi-scale mathematical models of sleep dynamics within social networks based on sleep and circadian physiology. These models will provide insights into the emergent dynamics of sleep behaviors within social networks, and allow us to test the effects of candidate strategies for intervening in populations with unhealthy sleep behaviors.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
4R01GM105018-04
Application #
9035405
Study Section
Special Emphasis Panel (ZGM1)
Program Officer
Marcus, Stephen
Project Start
2013-07-18
Project End
2018-03-31
Budget Start
2016-04-01
Budget End
2017-03-31
Support Year
4
Fiscal Year
2016
Total Cost
Indirect Cost
Name
Brigham and Women's Hospital
Department
Type
DUNS #
030811269
City
Boston
State
MA
Country
United States
Zip Code
McHill, Andrew W; Hull, Joseph T; McMullan, Ciaran J et al. (2018) Chronic Insufficient Sleep Has a Limited Impact on Circadian Rhythmicity of Subjective Hunger and Awakening Fasted Metabolic Hormones. Front Endocrinol (Lausanne) 9:319
Sano, Akane; Taylor, Sara; McHill, Andrew W et al. (2018) Identifying Objective Physiological Markers and Modifiable Behaviors for Self-Reported Stress and Mental Health Status Using Wearable Sensors and Mobile Phones: Observational Study. J Med Internet Res 20:e210
Asgari-Targhi, Ameneh; Klerman, Elizabeth B (2018) Mathematical modeling of circadian rhythms. Wiley Interdiscip Rev Syst Biol Med :e1439
Gottlieb, Daniel J; Ellenbogen, Jeffrey M; Bianchi, Matt T et al. (2018) Sleep deficiency and motor vehicle crash risk in the general population: a prospective cohort study. BMC Med 16:44
McHill, Andrew W; Hull, Joseph T; Wang, Wei et al. (2018) Chronic sleep curtailment, even without extended (>16-h) wakefulness, degrades human vigilance performance. Proc Natl Acad Sci U S A 115:6070-6075
Swaminathan, Krithika; Klerman, Elizabeth B; Phillips, Andrew J K (2017) Are Individual Differences in Sleep and Circadian Timing Amplified by Use of Artificial Light Sources? J Biol Rhythms 32:165-176
Bianchi, Matt T; Phillips, Andrew J K; Wang, Wei et al. (2017) Statistics for Sleep and Biological Rhythms Research. J Biol Rhythms 32:7-17
Phillips, Andrew J K; Clerx, William M; O'Brien, Conor S et al. (2017) Irregular sleep/wake patterns are associated with poorer academic performance and delayed circadian and sleep/wake timing. Sci Rep 7:3216
Phillips, Andrew J K; Klerman, Elizabeth B; Butler, James P (2017) Modeling the adenosine system as a modulator of cognitive performance and sleep patterns during sleep restriction and recovery. PLoS Comput Biol 13:e1005759
McHill, Andrew W; Phillips, Andrew Jk; Czeisler, Charles A et al. (2017) Later circadian timing of food intake is associated with increased body fat. Am J Clin Nutr 106:1213-1219

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