2006 | 2008 | ∆ 2006–2008 | ||||
---|---|---|---|---|---|---|
4th and 5th graders | 5th and 6th graders | |||||
Girls (n = 177–181) † | mean | SD | mean | SD | mean | SD |
Bedtime school day | 21:29 | 0:37 | 21:48 | 0:37 | 0:23*** | 0:36 |
Wake-up time school day | 7:10 | 0:26 | 7:01 | 0:25 | −0:10*** | 0:30 |
Bedtime weekend | 22:18 | 0:48 | 22:44 | 0:48 | 0:26*** | 0:47 |
Wake-up time weekend | 8:42 | 0:53 | 9:08 | 0:59 | 0:27*** | 0:52 |
Discrepancy of bedtimes | 0:53 | 0:35 | 0:56 | 0:38 | 0:04 | 0:42 |
Sleep duration school day | 9:48 | 0:40 | 9:13 | 0:43 | −0:32*** | 0:46 |
Sleep duration weekend | 10:24 | 0:57 | 10:24 | 1:00 | 0:01 | 1:04 |
Discrepancy in sleep duration | 0:39 | 0:58 | 1:12 | 1:00 | 0:33*** | 1:07 |
Boys (n = 159–172) † | ||||||
Bedtime school day | 21:24 | 0:41 | 21:41 | 0:39 | 0:18*** | 0:39 |
Wake-up time school day | 7:06 | 0:30 | 7:07 | 0:25 | 0:00 | 0:35 |
Bedtime weekend | 22:24 | 0:50 | 22:51 | 0:59 | 0:27*** | 0:48 |
Wake-up time weekend | 8:27 | 1:08 | 8:54 | 1:10 | 0:27*** | 1:01 |
Discrepancy of bedtimes | 1:01 | 0:41 | 1:11 | 0:47 | 0:09* | 0:47 |
Sleep duration school day | 9:42 | 0:48 | 9:25 | 0:44 | −0:18*** | 0:48 |
Sleep duration weekend | 10:03 | 1:12 | 10:03 | 1:08 | 0:00 | 1:15 |
Discrepancy in sleep duration | 0:20 | 1:13 | 0:37 | 1:08 | 0:18** | 1:13 |
All (n = 337–353) † | ||||||
Bedtime school day | 21:25 | 0:39 | 21:48 | 0:38 | 0:20*** | 0:37 |
Wake-up time school day | 7:08 | 0:28 | 7:03‡ | 0:25 | −0:05** | 0:32 |
Bedtime weekend | 22:21 | 0:49 | 22:48 | 0:54 | 0:26*** | 0:47 |
Wake-up time weekend | 8:35‡ | 1:01 | 9:01‡ | 1:05 | 0:27*** | 0:57 |
Discrepancy of bedtimes | 0:57 | 0:38 | 1:04‡‡ | 0:44 | 0:06* | 0:44 |
Sleep duration school day | 9:43 | 0:44 | 9:19‡‡ | 0:44 | −0:25*** | 0:47 |
Sleep duration weekend | 10:14‡‡ | 1:05 | 10:14‡‡ | 1:05 | 0:00 | 1:10 |
Discrepancy in sleep duration | 0:30‡‡ | 1:06 | 0:55‡‡‡ | 1:06 | 0:26*** | 1:10 |