The highest arousal thresholds ( e . g . difficulty of awakening, such as by a sound of a particular volume ) are observed in stage 3.
2.
The highest arousal thresholds ( i . e . difficulty of awakening, such as by a sound of a particular volume ) are observed in deep sleep.
3.
In both human infants and rats, arousal thresholds have been shown to be at higher levels in the electroencephalography ( EEG ) during slow-wave sleep.
4.
If they are deprived of this sleep-like behaviour, the sleep bouts thereafter are longer and the arousal threshold is higher than usual, suggesting a rebound effect.
5.
In 1992 a SIDS risk reduction strategy based upon lowering arousal thresholds during SWS was implemented by the American Academy of Pediatrics ( AAP ) which began recommending that healthy infants be positioned to sleep on their back ( supine position ) or side ( lateral position ), instead of their stomach ( prone position ), when being placed down for sleep.
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