Table 4. Amphetamine-related effects on sleep measures (night 2).

	Drug conditions
	Placebo	20 mg MA		40 mg MA		100 mg MDMA
	Mean (SEM)	Mean (SEM)	F value	Mean (SEM)	F value	Mean (SEM)	F value
Actiwatch measures (measurements from night 2)
Actual time slept (h)	6.5 (0.3)	6.4 (0.3)	0.2	7.1 (0.1)	6.3*	7.0 (0.1)	3.6
Sleep latency (min)	53.0 (15.6)	55.6 (18.5)	0.1	13.7 (4.9)	16.5*	18.9 (3.3)	12.4*
Sleep efficiency (%)	81.7 (3.2)	80.3 (3.9)	0.2	89.4 (1.5)	6.3*	87.5 (1.2)	3.6
Sleep questionnaire (measurements from night 2)
Estimated time slept	6.2 (0.4)	6.9 (0.3)	2.9	7.1 (0.2)	5.1*	7.1 (0.2)	6.0*
Fell asleep easily	39.2 (10.3)	62.6 (11.5)	6.0*	73.8 (4.8)	13.1*	52.6 (11.3)	2.0
Satisfied with sleep	42.7 (8.6)	61.8 (10.8)	5.7*	61.3 (9.2)	5.4*	61.6 (8.5)	5.6*
Slept well	46.5 (10.2)	67.3 (7.7)	6.7*	68.5 (5.2)	7.6*	73.0 (4.8)	11.0*

^*p<0.05, significantly different from placebo

^§p<0.05, significantly different from 20 mg MA

^†p<0.05, significantly different from 40 mg MA