Table 3.

Fixed and Random Effects of Nocturnal Sleep Predicting Daytime Napping

	Fixed effects	Random effects
		Intercept variance	Slope-intercept variance	Slope variance
	b (SE)	Estimate (SE)	Estimate (SE)	Estimate (SE)
Total sleep time	−0.002 (0.00)*	0.64 (0.11)*	−0.00 (0.00)*	1.89 (5.15)*
Wake after sleep onset	−0.34 (0.05)*	1.41 (0.32)*	−0.74 (0.19)*	0.41 (0.11)*
Sleep efficiency	−0.05 (0.02)*	0.13 (0.11)	−0.02 (0.02)	0.01 (0.01)
Sleep onset latency	0.01 (0.02)	0.10 (0.02)	−0.00 (0.01)	n/a

*p < .01.

n/a covariance parameter is redundant and cannot be computed.

All models included the following covariates: age, race, gender.