Table 1 Day- and person-level characteristics

Person-level (N_person = 56)

 Age (years)

83.23 (1.06)

82-86

 Gender (% female)

37.5

 Living arrangements

 (% living alone)

30.4

 Physical health

4.70 (0.54)

3-5

 Mental health

18.21 (4.29)

9-25

Day-level (N_days = 392)

 Time in bed (hours)

8.03 (1.21)

3.67-13.00

0.49

 Sleep satisfaction

3.95 (1.05)

1-5

0.63

 Positive emotions

3.05 (0.89)

1-5.63

0.37

 Negative emotions

1.94 (0.66)

1-4.38

0.68

 Fatigue

2.72 (1.12)

1-6

0.46

 Number of observations

 after waking

6.88 (0.68)

2-7

 Number of observations

 before going to bed

6.98 (0.13)

6-7