Table 2.

Mean sleep variables before and during pregnancy in an international sample of women with and without a stillbirth, 2012‐2014

Variable	Stillbirth (n = 153) Mean ± SD	Controls (n = 480) Mean ± SD
Sleep duration
Sleep duration before pregnancy (hours)	7.7 ± 0.9	7.6 ± 1.0
Sleep duration last month (hours)	7.9 ± 1.3**	7.5 ± 1.5
Sleep duration last night (hours)	6.4 ± 2.1	6.7 ± 2.1
Nap duration
Nap duration before pregnancy (hours)	0.9 ± 1.0	1.0 ± 0.9
Nap duration last month (hours)	1.6 ± 0.8	1.6 ± 0.9
Total 24‐h sleep duration
Total sleep in 24 h before pregnancy (hours)	8.7 ± 1.4	8.6 ± 1.4
Total sleep in 24 h last month (hours)	9.5 ± 1.5*	9.1 ± 1.8
Epworth Sleepiness Scale (ESS)
Total ESS before pregnancy	3.9 ± 3.0	3.9 ± 3.1
Total ESS last month	7.5 ± 4.9	7.0 ± 4.5

^* P < 0.05;

^** P < 0.01.