Supplementary Table 1.

Binary logistic regression examining the association between number of devices or frequent and infrequent device use in the bedroom and demographic parameters expressed OR (95% CI; p=value). Dash (-) denotes reference group.

Parameter		Number of devices (≤1 or ≥2	Smartphone	Tablet	Computer	Television	Radio	Music player
Age		1.01 (1.00-1.01; 0.04)	0.95 (0.95-0.96; p<0.0001)	0.99 (0.98-1.00; 0.20)	0.97 (0.96-0.99; p<0.0001)	1.03 (1.02-1.04; p<0.0001)	1.07 (1.06-1.09; p<0.0001)	0.95 (0.93-0.97; p<0.0001)
Gender	Female	-	-	-	-	-	-	-
	Male	1.29 (1.34-1.65; p<0.0001)	1.31 (1.15-1.50; p<0.0001)	1.44 (1.21-1.71; p<0.0001)	1.48 (1.23-1.78; p<0.0001)	0.52 (0.43-0.63; p<0.0001)	0.84 (0.55-1.30; 0.44)	1.46 (1.13-1.88; 0.004)
Marital status	Married	-	-	-	-	-	-	-
	Divorced	3.04 (2.32-3.97; p<0.0001)	1.54 (1.08-2.21; 0.02)	2.71 (1.89-3.89; p<0.0001)	3.50 (2.27-5.39; p<0.0001)	1.99 (1.26-3.12; 0.003)	1.07 (0.38-3.02; 0.90)	2.08 (1.03-4.18; 0.04)
	Single	4.87 (4.26-5.56; p<0.0001)	1.16 (0.99-1.37; 0.07)	1.81 (1.45-2.26; p<0.0001)	3.16 (2.42-4.12; p<0.0001)	2.43 (1.90-3.11; p<0.0001)	1.39 (0.80-2.40; 0.24)	2.28 (1.56-3.32; p<0.0001)
	Widowed	1.61 (0.90-2.88; p=0.11)	0.96 (0.51-1.82; 0.90)	2.03 (0.83-4.94; 0.12)	1.70 (0.40-7.25; 0.47)	1.31 (0.45-3.79; 0.62)	2.32 (0.80-6.69; 0.12)	Sample too small
Sleeping medication use	Never	-	-	-	-	-	-	-
	Several days	1.1 (0.95-1.29; 0.21)	0.93 (0.75-1.13; 0.46)	1.32 (1.07-1.65; 0.009)	0.89 (0.69-1.14; 0.35)	1.27 (0.99-1.63; 0.06)	0.85 (0.43-1.67; 0.64)	1.27 (0.94-1.71; 0.13)
	Over half of days	1.34 (0.98-1.84; 0.07)	0.93 (0.60-1.43; 0.73)	0.94 (0.60-1.50; 0.81)	1.13 (0.73-1.73; 0.59)	1.71 (1.11-2.65; 0.02)	1.32 (0.40-4.31; 0.65)	1.69 (1.02-2.78; 0.04)
	Nearly every day	1.06 (0.75-1.50; 0.75)	1.06 (0.67-1.68; 0.81)	1.68 (1.07-2.63; 0.02)	1.53 (0.94-2.51; 0.09)	1.79 (1.10-2.92; 0.02)	1.81 (0.70-4.68; 0.22)	1.35 (0.68-2.66; 0.39)