Table 2.

Correlations between nightmares frequency and frequency of other sleep related symptoms

Variables	Nightmare frequency
	r†
Frequency of insomnia symptoms
Difficulty initiating sleep	0.31*
Difficulty maintaining sleep	0.39*
Early morning awakening	0.28*
Sleep-related anxiety	0.35*
Frequency of sleep disordered breathing symptoms
Nocturnal breathing difficulty	0.18*
Nocturnal mouth breathing	0.19*
Gasps for breath or unable to breathe during sleep	0.07*
Snoring	0.16*
Frequency of parasomnia symptoms
Sleepwalking	0.12*
Sleep terror	0.28*
Sleep talking	0.38*
Frequency of other nocturnal sleep symptoms
Restless sleep	0.25*
Sleep in prone position with buttocks up and neck extended	0.17*
Bruxism	0.15*
Nocturnal sweating	0.22*
Frequency of sleep related daytime consequences
Unrefreshed in morning	0.26*
Daytime fatigue	0.31*
Difficulty getting out of bed in the morning	0.24*
Morning headache	0.24*
Morning dry mouth	0.27*

^†Spearman rank correlation coefficients.

^*P < 0.001.