Question

question 68
sleep spindles are defining characteristic of ____ sleep.
○ stage 3
○ stage 4
○ stage 2
○ stage 1

Explanation:

Sleep spindles (short bursts of brain activity) are a key feature of stage 2 non - rapid eye movement (NREM) sleep. Stage 1 is the transition to sleep, stage 3 and 4 are deep sleep (characterized by delta waves), while stage 2 has sleep spindles and K - complexes.

Answer:

C. stage 2 (assuming the options are labeled A, B, C, D with C being stage 2; if the original option labels are different, adjust accordingly. Based on the given options, the correct one is the option with "stage 2")