Vector Autoregression (VAR) of Longitudinal Sleep and Self-report Mood Data

Jeff Brozena

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arXiv · 2510.02511

Vector Autoregression (VAR) of Longitudinal Sleep and Self-report Mood Data

Jeff Brozena

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Abstract

Self-tracking is one of many behaviors involved in the long-term self-management of chronic illnesses. As consumer-grade wearable sensors have made the collection of health-related behaviors commonplace, the quality, volume, and availability of such data has dramatically improved. This exploratory longitudinal N-of-1 study quantitatively assesses four years of sleep data captured via the Oura Ring, a consumer-grade sleep tracking device, along with self-reported mood data logged using eMood Tracker for iOS. After assessing the data for stationarity and computing the appropriate lag-length selection, a vector autoregressive (VAR) model was fit along with Granger causality tests to assess causal mechanisms within this multivariate time series. Oura's nightly sleep quality score was shown to Granger-cause the presence of depressed and anxious moods using a VAR(2) model.

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Jeff Brozena. 2025-10-02. Vector Autoregression (VAR) of Longitudinal Sleep and Self-report Mood Data. https://arxiv.org/abs/2510.02511

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