Table 2.
Distribution of sleep metrics obtained from the Fitbit as well as weekly averages of the same for all sleep sessions preceding the cognitive tasks.
| Distribution of sleep metrics | N | Minimum | Maximum | Mean (SD) | |
| Previous night’s sleep metrics |
|
|
|
|
|
|
|
Sleep duration (minutes) | 556 | 180.0 | 761.0 | 433.12 (87.47) |
|
|
REMa sleep (%) | 556 | 2.8 | 34.25 | 18.18 (5.32) |
|
|
Light sleep (%) | 556 | 30.04 | 73.71 | 52.92 (6.95) |
|
|
Deep sleep (%) | 556 | 0.0 | 33.57 | 15.92 (5.1) |
|
|
Duration of REM sleep (minutes) | 556 | 6.0 | 190.0 | 79.24 (29.04) |
|
|
Duration of light sleep (minutes) | 556 | 79.0 | 429.0 | 228.98 (54.13) |
|
|
Duration of deep sleep (minutes) | 556 | 0.0 | 157.0 | 68.69 (25.12) |
|
|
Number of awake periods >5 minutes | 556 | 0.0 | 8.0 | 3.03 (1.33) |
|
|
Sleep efficiency (out of 100) | 556 | 27 | 100 | 89.6 (14.11) |
|
|
Sleep debt | 556 | –0.81 | 0.55 | 0.0 (0.18) |
|
|
Sleep shift | 556 | –425.04 | 1199.21 | 7.1 (122.18) |
| Sleep metrics over last 1 week |
|
|
|
|
|
|
|
Average sleep duration (minutes) | 556 | 221.0 | 564.25 | 433.27 (50.53) |
|
|
Average REM sleep duration (minutes) | 556 | 23.0 | 163.0 | 78.94 (15.59) |
|
|
Average light sleep duration (minutes) | 556 | 84.0 | 310.2 | 228.67 (36.2) |
|
|
Average deep sleep duration (minutes) | 556 | 28.0 | 123.5 | 69.14 (15.86) |
|
|
Average sleep debt | 556 | –0.17 | 0.19 | 0.0 (0.06) |
|
|
Average sleep shift | 556 | –311.47 | 202.93 | 6.97 (62.04) |
aREM: rapid eye movement.