Question

As a sleep researcher is monitoring you, he notices that your brain waves are showing almost all delta waves. He awakens you at this point, and you awaken in a complete state of confusion. You are most likely in which stage of sleep?

a. Stage 1 of NREM
b. Stage 2 of NREM
c. Stage 3 of NREM
d. Stage 4 of NREM

Answer 1

In a state where the brain shows almost all delta waves leading to waking up confused, the person is likely in stage 3 of NREM sleep, known as deep or slow-wave sleep. the correct option (c).

Step-by-step explanation:

NREM (Non-Rapid Eye Movement) Sleep:

NREM sleep consists of multiple stages, including stages 1, 2, 3, and 4.

These stages are characterized by different patterns of brain wave activity.

Delta Waves:

Delta waves are slow, high-amplitude brain waves associated with deep sleep.

Stage 3 of NREM sleep is often referred to as "slow-wave sleep" (SWS) because it is characterized by the presence of delta waves.

Awakening in Confusion:

If someone is awakened from deep sleep, especially during the stage with predominantly delta waves (Stage 3), they may experience sleep inertia or confusion upon waking.

Stages of NREM Sleep:

Stage 1: Light sleep, transition from wakefulness to sleep.

Stage 2: Slightly deeper sleep, characterized by sleep spindles and K-complexes.

Stage 3: Delta waves become prominent, marking the onset of deep sleep.

Stage 4: Continued deep sleep with a high percentage of delta waves.

Transition to REM Sleep:

After Stage 4, the sleep cycle typically transitions to REM (Rapid Eye Movement) sleep, characterized by vivid dreaming and increased brain activity.

The scenario described, with almost all delta waves and confusion upon awakening, is indicative of Stage 3 of NREM sleep.