Time course of sleep inertia after nighttime and daytime sleep episodes. To investigate the time course of sleep inertia, self- ratings of alertness and reaction time in a memory task were repeatedly assessed after nighttime and daytime sleep episodes in healthy young men. Alertness gradually increased and reaction time gradually decreased within the first hour after awakening. Their time course could be described by exponential functions with time constants of 0.45 h and 0.3 h, respectively. The data demonstrate that sleep inertia is a robust, quantifiable process that can be incorporated in models of sleep and vigilance.
Sleep deprivation increases brain serotonin turnover in the Djungarian fhamster.
Tissue concentrations of monoamines and of their metabolites were measured from several brain areas using HPLC with electrochemical detection. Temperature dependence of EEG frequencies during natural hypothermia. A systematic shift of single EEG frequencies was found as cortical temperature decreased. EEG slow waves and sleep spindles - windows on the sleeping brain. Dijk D.J. Slow waves and sleep spindles are prominent features of the EEG in non- REM sleep and some of the neurophysiological mechanisms underlying their genesis have been elucidated.