Infant age (months) | Overall (n) | Night-time sleep (hours)* | Daytime sleep (hours)† | 24-hour sleep (hours/day) | Number of night-time awakenings |
Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | ||
3 | 506 | 8.6 (1.7) | 5.1 (2.2) | 13.8 (2.7) | 2.0 (1.3) |
6 | 476 | 9.0 (1.6) | 4.0 (1.9) | 13.0 (2.3) | 1.7 (1.4) |
9 | 442 | 9.2 (1.5) | 3.6 (1.6) | 12.8 (2.2) | 1.6 (1.3) |
12 | 447 | 9.3 (1.4) | 3.3 (1.5) | 12.6 (1.8) | 1.4 (1.1) |
P value for linear trend‡ | <0.05 | <0.05 | 0.07 | <0.05 |
Among 558 mother–infant dyads enrolled in the prospective Nurture birth cohort study.
*Night-time sleep reflects sleep from 19:00 to 07:00.
†Daytime sleep reflects sleep from 07:00 to 19:00.
‡P values for linear trends are from simple linear regression models regressing night-time sleep, daytime sleep, 24-hour sleep, achieving 12 or more hours of sleep per night (%) or number of night-time awakenings on infant age (3, 6, 9 or 12 months).