PSYCHOLOGY OF EMOTIONS

Detailed explanation-1: -The second stage of NREM sleep on EEG shows theta waves, which, along with K-complexes and sleep spindles, are the defining characteristics of this stage.

Detailed explanation-2: -Stage 1 (N1) is characterized typically by the disappearance of the alpha rhythm and appearance of roving eye movements, which are slow, conjugate, to and fro deflections usually lasting approximately 500 milliseconds.

Detailed explanation-3: -The theta waves characteristic of Stage Two sleep are interrupted by occasional series of high-frequency waves known as sleep spindles. These bursts of activity have a frequency of eight to fourteen Hz and an amplitude of 50 to 150 µV. Sleep spindles generally last one to two seconds.