Table 2.

Sleep Continuity and Architecture for Nights 2 and 28 by Group

	Controls M (SD) [range]		Substance Users M (SD) [range]
Night	2 (n=20)	28 (n=20)	2 (n=29)	28 (n=20)
Total Sleep Time	456.2 (51.7) [352 – 526]	446.75 (44.2) [362 – 506]	454.69 (52.4) [348 – 567]	420.30 (53.9) [265 – 501]
Sleep Latency	14.05 (12.0) [4 – 53]	14.20 (13.2) [3 – 55]	22.26 (27.7) [3 – 136]	18.8 (20.3) [3 – 74]
Wake After Sleep Onset	27.0 (28.3) [4.5 – 126.0]	18.8 (14.4) [0.0 – 58.0]	20.7 (15.6) [2.0 – 62.5]	21.0 (18.4) [2.5 – 67.5]
Sleep Efficiency	90.8 (5.4) [73.3 – 96.4]	92.2 (3.2) [83.8 – 96.0]	90.7 (5.8) [72.0 – 97.0]	90.5 (5.9) [78.0 – 96.9]
Stage 1%	4.7 (3.4) [1.5 – 13.6]	3.7 (1.8) [0.0 – 6.9]	4.1 (1.8) [1.7 – 7.0]	4.6 (2.9) [1.3 – 11.3]
Stage 2%	54.6 (7.0) [40.7 – 65.2]	54.6 (8.6) [30.5 – 67.8]	51.6 (8.0) [29.2 – 64.6]	53.9 (6.9) [43.7 – 66.9]
Slow Wave Sleep % (SWS%)	20.4 (7.3) [10.4 – 42.3]	21.7 (9.9) [8.0 – 57.6]	20.9 (7.6) [8.3 – 36.8]	21.0 (5.7) [8.5 – 28.5]
Rapid Eye Movement Sleep % (REM%)	20.2 (5.8) [9.5 – 33.0]	20.0 (3.5) [11.9 – 26.3]	23.4 (5.7) [8.3 – 35.8]	20.6 (4.0) [12.7 – 27.9]
REM Latency	87.0 (40.3) [0.0–170.0]	88.5 (31.9) [56.0–161.5]	77.0 (52.9) [0.0–249.5]	102.5 (51.3) [50.0–200.0]
REM Density	2.2 (0.6) [1.0–3.0]	2.1 (0.6) [1.0–4.0]	2.2 (0.7) [1.0–3.0]	2.2 (0.8) [0.0–4.0]
Periodic Limb Movement Index	3.8 (5.8) [0.0 – 23.7]	3.8 (5.1) [0.0 – 16.2]	2.6 (4.4) [0.0 – 15.9]	3.8 (5.1) [0.0 – 17.6]
Periodic Limb Movement Arousal Index	0.8 (1.5) [0.0 – 6.8]	0.4 (0.6) [0.0 – 2.1]	0.9 (1.4) [0.0 – 5.9]	1.2 (2.2) [0.0 – 9.7]