EEG sleep patterns in schizophrenic patients undergoing hemodialysis.

All-night electroencephalographic (EEG) sleep studies were obtained before and during a double-blind clinical trial of hemodialysis in six schizophrenic patients with normal renal functioning. No significant changes were observed in either clinical status or sleep, except for a significant reduction in rapid eye movement (REM) density, a measure of the number of eye movements per minute of REM sleep.