. Author manuscript; available in PMC: 2020 Aug 6.

Published in final edited form as: J Biol Rhythms. 2019 Apr 24;34(3):323–331. doi: 10.1177/0748730419844650

Table 3.

Seasonal distribution of sleep onset (mean vector, 95%CI) during pregnancy in women (N=39). Note the chronotype advance during pregnancy in all four seasons.

Sleep Onset by Season of Delivery
	Fall	Winter	Spring	Summer
Total Deliveries (#)	8	10	9	12
Sleep Onset Baseline Mean Vector (95% CI)	10:02 PM (9:45PM,10:20PM)	10:38 PM (10:04PM,11:12 PM)	10:27 PM (9:38PM,11:16PM)	10:09 PM (9:51PM, 10:26PM)
Sleep Onset T1	9:36 PM (8:58PM,10:14PM)	10:16 PM (9:49PM,10:42PM)	10:04 PM (9:16PM,10:53PM)	9:45 PM, (9:21PM, 10:10 PM)
Sleep Onset T2	9:58 PM (9:36PM,10:20PM)	10:15 PM (9:48PM,10:43PM)	10:15 PM (9:25PM,11:05PM)	9:37 PM (9:11PM,10:02PM)
Sleep Onset T3	10:11 PM (9:44PM,10:38PM)	10:25 PM (10:01PM,10:49PM)	10:18 PM (9:20PM,11:15PM)	10:20 PM (9:55PM,10:46PM)