A patient with complaints of somnambulism has fallen asleep. She passes from light sleep into a deeper sleep. Just before she experiences an episode of somnambulism, her electroencephalogram is likely to show
A. alpha waves
B. beta waves
C. delta waves
D. sleep spindles and K-complexes
E. theta waves
A. alpha waves
B. beta waves
C. delta waves
D. sleep spindles and K-complexes
E. theta waves