Answer:
NREM- 2 sleep
Explanation:
NREM- 2 sleep -
It refers to as the very second stage of the sleep ,
In this step -
The living organism spend almost half of the sleep in this very stage .
The brain starts to generate rhythmic brain wave activity , which is known as the sleep spindles .
hence , from the given scenario of the question ,
The correct answer is NREM- 2 sleep .