Pupil Size Coupling to Cortical States Protects the Stability of Deep Sleep via Parasympathetic Modulation.

ABSTRACT: During wakefulness, pupil diameter can reflect changes in attention, vigilance, and cortical states. How pupil size relates to cortical activity during sleep, however, remains unknown. Pupillometry during natural sleep is inherently challenging since the eyelids are usually closed. Here, we present a novel head-fixed sleep paradigm in combination with infrared back-illumination pupillometry (iBip) allowing robust tracking of pupil diameter in sleeping mice. We found that pupil size can be used as a reliable indicator of sleep states and that cortical activity becomes tightly coupled to pupil size fluctuations during non-rapid eye movement (NREM) sleep. Pharmacological blocking experiments indicate that the observed pupil size changes during sleep are mediated via the parasympathetic system

SUBMITTER: Yuzgec O 

PROVIDER: S-EPMC5807087 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature