Too little or too much: nonlinear relationship between sleep duration and daily affective well-being in depressed adults

Table 1 Descriptive Statistics and Day-level Correlations (N = 2,012; N_days = 14,811)

Depression and daily variable	M (SD)	Range	1	2
Depressed (n = 214; n_days = 1,485)
1. Sleep duration	6.94 (1.83)	0–15
2. Positive affect	2.24 (0.99)	0–4	0.07^**
3. Negative affect	0.43 (0.55)	0–3.5	-0.12^***	-0.57^***
Non-depressed (n = 1,798; n_days = 13,326)
1. Sleep duration	7.15 (1.44)	0–18
2. Positive affect	2.79 (0.74)	0–4	0.05^***
3. Negative affect	0.17 (0.28)	0–3.1	-0.08^***	-0.44^***

Note. For descriptive statistics and correlations, original values of sleep duration were used. ^**p < 0.01, ^***p < 0.001

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