Table 2. Sleep-related and respiratory symptoms (%).

	No asthma and/or COPD n = 23 152	Asthma n = 1 665	COPD n = 362	ACO n = 250	p value
Difficulty initiating sleep	11.3	18.8	27.7	37.3	< 0.0001
Difficulty maintaining sleep	32.3	40.7	43.4	53.9	< 0.0001
Early-morning awakening	16.7	22.8	26.9	39.7	< 0.0001
Excessive daytime sleepiness	21.9	33.4	39.0	45.2	< 0.0001
Wheeze	12.7	71.4	48.9	83.7	< 0.0001
Nocturnal chest tightness	7.8	37.7	25.0	52.4	< 0.0001
Nocturnal breathlessness	3.8	20.1	14.4	35.7	< 0.0001
Nocturnal cough	22.0	51.6	45.0	63.6	< 0.0001
Chronic bronchitis	7.8	28.6	32.7	43.3	< 0.0001