Table 1.

Results of Multilevel Models Examining Associations Between Alcohol Use and Sleep Duration and Quality

	Sleep Duration			Sleep Quality
Fixed Effects	Est.	SE	p-value	Est.	SE	p-value
Intercept (γ00)	6.67*	0.06	<.001	64.81*	1.00	<.001
Day’s Alcohol Use (γ10)	−0.02	0.02	.32	−0.71*	0.32	.03
Friday/Saturday (γ20)	0.36*	0.04	<.001	1.83*	0.47	< .001
Sunday (γ30)	0.12*	0.04	.004	1.13*	0.51	.03
Day’s Caffeine Use (γ40)	−0.08*	0.02	<.001	−0.75*	0.23	.001
Previous Day’s Sleep Quality (γ50)	0.001	0.001	.51	−0.23*	0.01	<.001
Previous Day’s Sleep Duration (γ60)	−0.22*	0.01	<.001	−0.04	0.15	.77
Usual Alcohol Use (γ01)	0.33*	0.08	<.001	−3.06*	1.36	.03
Usual Caffeine Use (γ02)	0.02	0.05	.65	−1.06	0.87	.23
Age (γ03)	−0.01	0.003	.12	0.11*	0.05	.04
Gender (γ04)	−0.10	0.12	.41	2.85	2.00	.16
Usual Sleep Duration/Quality (γ05)	0.03*	0.005	<.001	7.50*	1.25	<.001
Day’s Alcohol Use X Usual Alcohol Use (γ11)	−0.01	0.02	.91	0.44	0.33	.18
Day’s Alcohol Use X Usual Caffeine Use (γ12)	−0.01	0.02	.69	−0.0001	0.26	.99
Day’s Alcohol Use X Age (γ13)	−0.001	0.001	.47	−0.002	0.02	.87
Day’s Alcohol Use X Gender (γ14)	−0.01	0.04	.76	−0.004	0.55	.99
Day’s Alcohol Use X Usual Sleep Duration/Quality (γ15)	0.002	0.002	.24	−0.11	0.34	.74
Random Effects	Est.	CI		Est.	CI
Intercept (${\sigma }_{u_0}^2$)	0.65	0.57 – 0.75		11.14	9.76 – 12.72
Day’s Alcohol Use (${\sigma }_{u_1}^2$)	0.10	0.06 – 0.16		1.65	1.15 – 2.36
Correlation (ru0u1)	0.11	−0.11 – 0.32		−0.10	−0.34 – 0.15
AR(1)	0.35	0.32 – 0.39		0.44	0.41 – 0.50
Residual (${\sigma }_e^2$)	1.37	1.34 – 1.40		18.72	18.28 – 19.17
Fit Indices
AIC	28433.83			71520.80
BIC	28588.52			71675.49

Note: N_observations = 8381 days nested within 150 persons; AIC = Akaike information criteria; BIC = Bayesian information criteria; SE = standard error; CI = confidence intervals.

^*p < .05.