Why the study?
Does delayed sleep onset alter the diurnal variation in cardiac activity and autonomic control compared to normal sleep onset?
Population
30 subjects (n=13 in normal sleep onset condition, n=17 in delayed sleep onset condition)
Comparison
Delayed sleep onset (DSO) by 3 hours vs Normal sleep onset (NSO)
Design
Other
Follow-up
overnight (until morning awakening)
Authors
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Supports sleep onset as primary driver of nocturnal BP dipping and vagal tone; hypothesis-generating for impact of delayed sleep on diurnal cardiac rhythms.
Does delayed sleep onset alter the diurnal variation in cardiac activity and autonomic control compared to normal sleep onset?
The study demonstrates that nocturnal blood pressure dipping and increased vagal tone are primarily driven by sleep onset, whereas heart rate and sympathetic activity are more strongly influenced by circadian rhythms.
Carrington et al. (2003) studied this question.
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