Table 3.

Parameters estimates for models predicting sleep quality and sleepiness across the academic year.

	Sleep Quality			Sleepiness
	Est	SE	t	Est	SE	t
Fixed Effects
Intercept (1st year students)	6.578	0.374	17.57***	8.747	0.496	17.63***
2nd year students	0.705	0.527	1.34	0.947	0.710	1.33
3rd year students	0.930	0.507	1.83	0.506	0.677	0.75
4th year students	1.540	0.564	2.73**	1.431	0.749	1.91
Time (1st year)	0.282	0.103	2.75**	0.267	0.155	1.72
Time x 2nd year	−0.244	0.141	−1.73	−0.312	0.216	−1.45
Time x 3rd year	−0.256	0.139	−1.85	−0.192	0.210	−0.91
Time x 4th year	−0.569	0.158	−3.61***	−0.486	0.241	−2.02*
Random EFFECTS
Between-Person variance (level-2)	8.865	0.862	10.28***	13.304	1.459	9.12***
Within-Person variance (level-1)	2.821	0.231	12.18***	6.686	0.648	10.32***

Time is coded as 0 = Time 1. First year students are the reference group.

^*p < 0.05;

^**p < 0.01;

^***p < 0.001.