Carla's sleep is being monitored in a research lab.The assistant notices that Carla's EEG shows a high presence of sleep spindles.It can be concluded that Carla is in
A) REM.
B) Stage 1 of NREM.
C) Stage 2 of NREM.
D) Stage 3 of NREM.

Question

Quizplus · Accepted Answer

Sleep spindles are a defining characteristic of Stage 2 of NREM sleep, consisting of bursts of high-frequency brain waves. REM sleep is characterized by rapid eye movements, low muscle tone, and high brain activity resembling waking state, whereas Stage 1 NREM is characterized by a transition from wakefulness to sleep and is generally brief. Stage 3 NREM is also known as slow-wave sleep, characterized by delta waves in the EEG, and it is typically seen in the first third of the night. Thus, based on the presence of sleep spindles reported in the question, the best choice is Stage 2 of NREM.

Carla's Sleep Is Being Monitored in a Research Lab