Hormonal
Higher levels of perceived loneliness are associated with increased objective sleep fragmentation, independent of sleep duration, negative affect, and demographic factors.
If you feel lonely, your sleep may be breaking up into more fragments, even if you are in bed for the usual amount of time. This is a biological stress response to feeling unsafe socially, not just a mood issue. Focus on creating a sense of security and connection, as this may help restore sleep continuity more effectively than just trying to extend total sleep time.
Higher loneliness scores were associated with significantly higher levels of sleep fragmentation (β = 0.073, t = 2.55, P = 0.01), controlling for age, sex, body mass index, risk of sleep apnea, and negative affect... Loneliness was not associated with sleep duration or with either subjective sleep measure.
Why this rating
The study uses objective actigraphy measures in a unique, low-confounding population (Hutterites), though the cross-sectional design limits causal inference.
Source
Loneliness Is Associated with Sleep Fragmentation in a Communal Society
Lianne M. Kurina et al. · SLEEP · 2011
DOI 10.5665/sleep.1390
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