. Author manuscript; available in PMC: 2008 Dec 5.

Published in final edited form as: Sleep. 2005 May 1;28(5):637–643. doi: 10.1093/sleep/28.5.637

Table 2.

Sleep Schedule and Vigilance-State Durations for the First Recording Session^*

	9-Year-Old	12-Year-Old	9-Year-Old Boys	9-Year-Old Girls	12-Year-Old Boys	12-Year-Old Girls
Bedtime	21:15^† ± :06	21:54^† ± :07	21:29^A ± :10	21:01^B ± :04	22:04^C ±:08	21:44^C ±:11
Wake Time	06:50^† ± :05	06:34^† ± :05	06:46^A ± :06	06:55^A ± :09	06:47^A ± :07	06:21^B ± :06
Time in Bed, min	575^† ± 8	520^† ± 10	557 ^A ± 10	594^B ± 8	517^C ± 16	523^C ± 13
NREM, min	400^† ± 8	361^† ± 8	386^AB ± 13	415^A ± 8	367^BC ± 9	356^C ± 13
REM, min	121 ± 4	113 ± 5	117 ± 5	126 ± 7	108 ± 6	118 ± 7

Data are presented as mean ± SEM for the 2 age cohorts and for each age-sex group.

^†

Significant (α= .05) age effect in analysis of variance. Post hoc multiple comparisons were conducted between sexes within the 2 age cohorts and between ages within the 2 sexes. NREM refers to non-rapid eye movement sleep; REM, rapid eye movement sleep.

Age-sex groups that do not differ share a common superscript.