Sleep Spindles Characteristics in Insomnia Sufferers and Their Relationship with Sleep Misperception

Table 4

Difference between good sleepers, paradoxical and psychophysiological insomnia sufferers according to sleep spindles characteristics on night 3.

Spindles characteristics	Stage 2		SWS
	H value (Kruskal-Wallis)		H value (Kruskal-Wallis)
Number	1.613	0.446	1.496	0.473
Density (spindles/min)	1.329	0.525	1.832	0.400
Duration (sec)	8.769	0.012	1.200	0.549
Frequency (Hz)	2.890	0.236	0.814	0.666
Amplitude (μv)	1.076	0.584	1.093	0.579

Note.: significant difference between the groups. SWS: slow wave sleep.