In plain words
Arousal threshold is how easily a sleeping person wakes up. A baby with a low arousal threshold wakes more easily to noise, touch, or a change in breathing. A baby with a high threshold may sleep through more of these signals. Researchers study this because waking helps babies respond when their breathing or position is unsafe. Some features of sleep, such as a tight or an overly warm room, may change arousal in some babies. This is an area of active research, and the findings are not yet clear enough to give simple rules. guidance from pediatric groups rests on broader evidence than these findings.
The deeper version
Arousal threshold is the minimum stimulus intensity needed to produce an electroencephalographic or behavioral arousal from sleep. In infants it is studied within the literature, where reduced arousal responses to hypoxia or hypercapnia have been reported in some infants who died. Richardson and colleagues (2010, Journal of Pediatrics) found that swaddled infants had altered autonomic control and, in infants not accustomed to swaddling, a higher arousal threshold in response to a stimulus. Sleep position and bedding are among the factors studied for their effect on arousal. The controversy concerns whether arousal deficits are a cause of sudden death or a marker of vulnerable infants, and whether swaddling's effect on arousal changes safe-sleep risk.
Where it comes up
What mothers here say about arousal threshold
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Sources
- Richardson HL and colleagues, Journal of Pediatrics — Swaddling and autonomic control in infants (2010)