Table 2.
Change in bedtime (minutes from midnight), sleep duration (minutes), and variability (standard deviation) of bedtime and sleep minutes change from January to April, with size of the difference (delta) for 2019 and 2020 and effect size (Cohen's D) among both men and women, across age groups
| Metric | Age | Jan 2020 | April 2020 | Δ 2020 | D 2020 | Jan 2019 | April 2019 | Δ 2019 | D 2019 |
|---|---|---|---|---|---|---|---|---|---|
| Female | |||||||||
| Bedtime | 18-29 | 23:47 ± 69.6 | 00:10 ± 81.6 | 23.7 | −0.39 | 23:50 ± 67.6 | 23:47 ± 66.8 | −2.8 | 0.06 |
| 30-49 | 23:20 ± 64.4 | 23:40 ± 74.4 | 19.9 | −0.4 | 23:22 ± 63.2 | 23:20 ± 61.0 | −1.5 | 0.04 | |
| 50-64 | 23:15 ± 66.3 | 23:28 ± 74.7 | 13.3 | −0.31 | 23:13 ± 63.0 | 23:12 ± 61.0 | −0.6 | 0.02 | |
| 65+ | 23:25 ± 71.1 | 23:37 ± 78.3 | 11.8 | −0.3 | 23:25 ± 69.6 | 23:24 ± 67.8 | −0.6 | 0.02 | |
| Sleep minutes | 18-29 | 420.8 ± 42.0 | 431.9 ± 45.2 | 11.1 | −0.27 | 419.3 ± 41.1 | 411.1 ± 40.2 | −8.2 | 0.24 |
| 30-49 | 410.2 ± 45.4 | 419.4 ± 48.8 | 9.2 | −0.25 | 409.6 ± 44.0 | 403.3 ± 42.8 | −6.4 | 0.2 | |
| 50-64 | 401.3 ± 49.7 | 406.1 ± 52.7 | 4.8 | −0.14 | 400.3 ± 47.5 | 393.0 ± 46.1 | −7.3 | 0.25 | |
| 65+ | 403.0 ± 55.1 | 401.9 ± 57.4 | −1.1 | 0.03 | 401.0 ± 53.7 | 393.3 ± 51.8 | −7.8 | 0.25 | |
| Bedtime variability | 18-29 | 69.7 ± 23.8 | 62.4 ± 24.2 | −7.3 | 0.24 | 70.0 ± 23.1 | 67.6 ± 23.0 | −2.4 | 0.09 |
| 30-49 | 65.9 ± 24.7 | 61.2 ± 25.2 | −4.7 | 0.16 | 65.3 ± 24.4 | 63.7 ± 23.6 | −1.5 | 0.06 | |
| 50-64 | 63.6 ± 25.3 | 60.5 ± 26.4 | −3.2 | 0.11 | 62.8 ± 24.7 | 61.8 ± 24.0 | −1 | 0.04 | |
| 65+ | 63.7 ± 27.5 | 60.7 ± 28.4 | −2.9 | 0.11 | 63.1 ± 26.8 | 62.7 ± 26.5 | −0.4 | 0.02 | |
| Sleep minutes variability | 18-29 | 77.6 ± 25.5 | 71.8 ± 26.9 | −5.8 | 0.21 | 76.7 ± 25.1 | 74.5 ± 24.7 | −2.2 | 0.08 |
| 30-49 | 73.9 ± 24.4 | 70.3 ± 25.9 | −3.6 | 0.14 | 72.9 ± 23.9 | 70.5 ± 23.4 | −2.4 | 0.1 | |
| 50-64 | 73.5 ± 24.1 | 70.2 ± 25.3 | −3.2 | 0.14 | 72.2 ± 23.4 | 69.8 ± 22.8 | −2.4 | 0.11 | |
| 65+ | 73.0 ± 24.7 | 69.8 ± 25.4 | −3.2 | 0.14 | 72.4 ± 24.5 | 70.7 ± 23.5 | −1.7 | 0.08 | |
| Male | |||||||||
| Bedtime | 18-29 | 00:11 ± 77.6 | 00:35 ± 89.5 | 24 | −0.35 | 00:14 ± 75.4 | 00:12 ± 75.2 | −2.1 | 0.04 |
| 30-49 | 23:44 ± 72.1 | 24:01 ± 80.9 | 16.6 | −0.31 | 23:46 ± 69.9 | 23:44 ± 68.5 | −2 | 0.05 | |
| 50-64 | 23:24 ± 69.6 | 23:33 ± 77.4 | 9.4 | −0.21 | 23:24 ± 66.7 | 23:23 ± 65.5 | −0.8 | 0.02 | |
| 65+ | 23:26 ± 73.5 | 23:35 ± 79.8 | 8.4 | −0.21 | 23:26 ± 71.3 | 23:24 ± 70.0 | −1.4 | 0.04 | |
| Sleep minutes | 18-29 | 398.4 ± 41.5 | 406.1 ± 44.9 | 7.7 | −0.2 | 398.0 ± 40.4 | 391.4 ± 40.2 | −6.6 | 0.2 |
| 30-49 | 386.2 ± 44.5 | 391.6 ± 47.6 | 5.4 | −0.15 | 385.5 ± 43.7 | 380.2 ± 42.5 | −5.3 | 0.18 | |
| 50-64 | 381.3 ± 50.5 | 386.0 ± 53.5 | 4.7 | −0.14 | 380.5 ± 48.4 | 374.4 ± 47.2 | −6.1 | 0.21 | |
| 65+ | 387.6 ± 58.6 | 388.4 ± 61.0 | 0.8 | −0.02 | 385.6 ± 56.3 | 379.1 ± 54.3 | −6.5 | 0.2 | |
| Bedtime variability | 18-29 | 72.7 ± 25.5 | 65.2 ± 26.9 | −7.6 | 0.24 | 72.4 ± 24.4 | 70.0 ± 24.1 | −2.4 | 0.08 |
| 30-49 | 69.8 ± 26.1 | 63.7 ± 26.4 | −6.2 | 0.21 | 68.4 ± 25.2 | 66.7 ± 24.3 | −1.7 | 0.06 | |
| 50-64 | 65.1 ± 26.2 | 60.1 ± 27.8 | −5 | 0.18 | 64.1 ± 25.7 | 63.0 ± 24.9 | −1 | 0.04 | |
| 65+ | 61.4 ± 27.8 | 57.1 ± 28.7 | −4.3 | 0.16 | 61.4 ± 27.3 | 60.8 ± 26.7 | −0.6 | 0.02 | |
| Sleep minutes variability | 18-29 | 74.6 ± 25.1 | 69.7 ± 26.5 | −4.9 | 0.18 | 73.6 ± 24.5 | 71.8 ± 24.3 | −1.9 | 0.07 |
| 30-49 | 72.2 ± 23.6 | 68.1 ± 24.6 | −4.1 | 0.17 | 70.7 ± 23.0 | 68.9 ± 22.4 | −1.8 | 0.08 | |
| 50-64 | 71.2 ± 23.5 | 67.5 ± 24.3 | −3.8 | 0.16 | 69.8 ± 22.8 | 67.9 ± 22.0 | −1.9 | 0.09 | |
| 65+ | 70.4 ± 24.5 | 67.1 ± 25.2 | −3.4 | 0.15 | 69.4 ± 23.8 | 67.5 ± 22.9 | −1.9 | 0.09 |