Autonomic Nervous System Dynamics in Sleep Disorders

The autonomic nervous system (ANS) exerts critical control over cardiovascular and respiratory function across sleep stages, with the balance between sympathetic and parasympathetic branches shaping normal and disordered sleep. In healthy non-rapid eye movement (NREM) sleep, parasympathetic dominance promotes cardiovascular stability, whereas rapid eye movement (REM) sleep features intermittent sympathetic surges superimposed on a parasympathetic baseline. In sleep disorders such as insomnia and obstructive sleep apnoea, this equilibrium is perturbed: insomnia is characterised by persistent sympathetic hyperarousal and reduced parasympathetic tone, leading to prolonged sleep onset latency, fragmented sleep, and elevated nocturnal heart rate. In obstructive events, repetitive respiratory pauses trigger blood pressure surges and sympathetic activation, heightening cardiovascular risk. Emerging evidence links chronic autonomic imbalance during sleep to long-term metabolic dysregulation, neurocognitive decline and increased mortality. Advances in wearable and ambulatory monitoring now permit continuous tracking of heart rate variability, pulse wave propagation and movement, enabling detailed phenotyping of autonomic dysregulation. Such approaches support personalised interventions—from digital biofeedback and mindfulness-based breathing to targeted neurostimulation—aimed at restoring autonomic harmony, improving sleep quality and mitigating downstream health consequences.

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Autonomic Nervous System Dynamics in Sleep Disorders publication trend

The graph below shows the total number of articles in autonomic nervous system dynamics in sleep disorders across all publications each year (not limited to Nature Index journals).

Technical terms

Heart rate variability (HRV): Fluctuations in intervals between successive heartbeats, used to infer autonomic balance.

Low-frequency (LF) power: Spectral component of HRV (0.04–0.15 Hz) reflecting combined sympathetic and parasympathetic modulation.

High-frequency (HF) power: Spectral component of HRV (0.15–0.4 Hz) primarily representing parasympathetic (vagal) activity.

LF/HF ratio: Index of sympatho-vagal balance, with higher values indicating relative sympathetic dominance.

Pulse propagation time (PPT): Time interval between cardiac ejection and peripheral pulse arrival, inversely related to arterial stiffness.

Actigraphy: Continuous recording of movement, used to infer sleep–wake patterns and nocturnal arousals.

References

1. Evaluation of Autonomic Nervous System Function During Sleep by Mindful Breathing Using a Tablet Device: Randomized Controlled Trial. JMIR Nursing (2024).
2. Combining cardiac monitoring with actigraphy aids nocturnal arousal detection during ambulatory sleep assessment in insomnia. Sleep (2022).
3. Overnight pulse wave analysis to assess autonomic changes during sleep in insomnia patients and healthy sleepers. PLOS ONE (2020).