Interactions between the autonomic and central nervous system during the first slow-sleep cycle

Abstract

To characterise the different sleep states and look for the spatial and frequential changes in the different regions of the brain during the awake-slow sleep transition and the interactions between the cardiac activity and respiration and also to study the relationship between the left and right cerebral hemispheres during sleep by cross correlation of the momentary band power time series' of EEG, heart-rate variability (HRV) and respiration signals for the different frequency bands for each sleep state and their moments by linear regression analysis. Subdivision of alpha frequency band into two (i.e., alpha 1 and alpha2). Transition from one state to another-linear regression analysis. parasympathetic-sympathetic balance during the wake-sleep cycle: seen from the mean normalised cardiac activity.