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Theta waves are brainwaves that become more prominent as Stage 1 sleep progresses. They are characterized by a lower frequency (4–7 Hz) and a higher amplitude when compared to the alpha waves that precede them in this stage.

Theta Waves

An individual is being monitored with an electroencephalogram (EEG) as they relax with their eyes closed and begin to fall asleep. The recording initially shows a pattern consistent with a relaxed, awake state. What specific change in the EEG recording would indicate the onset of the very first stage of sleep?

A sleep researcher observes a participant's EEG readings as they transition from a state of relaxed wakefulness into the earliest stage of sleep. Which of the following patterns would most accurately represent this transition?

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