The large,slow brain waves associated with N3 sleep are called

A) alpha waves.
B) beta waves.
C) sleep spindles.
D) delta waves.

Delta Waves

Low frequency brain waves that indicate deep sleep or meditation.

Alpha Waves

Brainwave patterns associated with a state of wakeful relaxation.

Sleep Spindles

Bursts of oscillatory brain activity visible on an EEG that occur during stage 2 of non-REM sleep, often associated with learning, memory, and the brain's ability to reorganize itself.