What EEG pattern might be expected after rapid eye movement (REM) sleep?

After rapid eye movement (REM) sleep, an EEG pattern characterized by a mixed frequency pattern is expected. This mixed frequency activity typically consists of low-amplitude, fast frequencies alongside some slower waves. During REM sleep, the brain exhibits a high level of activity similar to that found during wakefulness, which is reflected in the EEG as mixed frequency activity. This pattern indicates that the brain is engaged in processes like dreaming, with the activation of various brain regions.

In contrast, other EEG patterns are associated with different states of consciousness and sleep stages. Increased delta activity is more characteristic of deep slow-wave sleep (non-REM sleep), while increased alpha activity is usually seen when an individual is awake and relaxed, particularly with closed eyes. A decrease in activity overall would imply a reduced state of arousal or brain activity, which does not align with the heightened brain functions during REM sleep.