N1 sleep is characterized by

A) deep relaxation and sleep spindles.
B) slowed breathing and irregular brain waves.
C) large,slow delta waves.
D) rapid brain waves and increased heart rate.

Sleep Spindles

Brief bursts of brain activity characterized by rapid oscillations, seen in the stage 2 of non-REM sleep, thought to be involved in memory consolidation.

Delta Waves

Slow brain waves observed in deep sleep, associated with restoration and healing in the human brain.

Rapid Brain Waves

Fast-frequency brainwave patterns observed in the brain's electrical activity, typically associated with alertness, attention, and cognitive processing.