Skip to main content
. Author manuscript; available in PMC: 2016 Jun 1.
Published in final edited form as: J Sleep Res. 2014 Nov 13;24(3):279–287. doi: 10.1111/jsr.12260

Table 2.

Actigraphic sleep measures during the 4 days, as well as 24 hours before each challenge task assessment. One-tailed paired t-tests were performed between nap and no-nap conditions.

4 days Before Assessments Nap No-Nap Statistics

M SD M SD t d P




Daytime Sleep (Nap)
 Days Napping (fell asleep) 3.3 0.89 3.3 0.87 −.43 .00 .67
 Lights-Out Time 13:23 0:45 13:22 0:49 .04 .02 .97
 Rise Time 15:13 0:33 15:16 0:40 −.23 .08 .82
 Time in Bed (minutes) 110.3 19.6 113.9 15.2 −1.05 .21 .31
 Sleep Start Time 13:49 0:57 13:55 0:59 −.35 .10 .73
 Sleep End Time 15:12 0:51 15:14 0:52 −.45 .04 .66
 Sleep Period (minutes) 84.00 20.5 78.6 11.8 −.49 .32 .63
 Sleep Efficiency (%) 93.4 4.9 94.1 2.8 −.99 .18 .35
Nighttime Sleep
 Lights-Out Time 19:59 0:28 20:03 0:28 −.80 .14 .44
 Rise Time 6:51 0:27 6:53 0:25 −.56 .08 .58
 Time in Bed (minutes) 651.4 40.4 650.4 39.7 .20 .02 .84
 Sleep Start Time 20:40 0:33 20:41 0:35 −.56 .03 .59
 Sleep End Time 6:40 0:28 6:44 0:24 −.70 .15 .50
 Sleep Period (minutes) 599.5 41.9 602.9 39.3 −.48 .08 .64
 Sleep Efficiency (%) 85.2 3.8 83.4 5.0 1.93 .41 .08
Total 24 h Sleep
 Time in Bed (minutes) 761.7 39.7 764.4 37.5 −.45 .07 .66
 Sleep Period (minutes) 682.3 40.2 681.5 33.6 −.75 .02 .46

24 h Before Assessments M SD M SD t D P




Daytime Sleep (Nap)
 Lights-Out Time 13:16 0:41 - - - - -
 Rise Time 15:06 0:53 - - - - -
 Time in Bed (minutes) 110.3 20.4 - - - - -
 Sleep Start Time 13:37 0:48 - - - - -
 Sleep End Time 14:58 0:55 - - - - -
 Sleep Period (minutes) 81.6 16.6 - - - - -
 Sleep Efficiency (%) 94.6 3.0 - - - - -
Nighttime Sleep
 Lights-Out Time 19:55 0:30 20:00 0:24 −1.09 .18 .29
 Rise Time 7:00 0:26 7:03 0:23 −.29 .12 .77
 Time in Bed (minutes) 665.3 44.3 662.6 33.8 −1.1 .07 .31
 Sleep Start Time 20:33 0:47 20:31 0:30 −.42 .05 .69
 Sleep End Time 6:51 0:30 6:54 0:31 .59 .10 .57
 Sleep Period (minutes) 617.7 53.7 623.2 39.3 −.49 .12 .63
 Sleep Efficiency (%) 87.4 5.6 84.0 7.8 1.27 .50 .24
Total 24 h Sleep
 Time in Bed (minutes) 761.7 39.7 662.6 33.8 11.3 2.7 .001
 Sleep Period (minutes) 682.3 40.2 623.2 39.3 7.6 1.5 .001