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The Bland–Altman plots for SOL, WASO, TST and SE, Left, B–A plots for AW2 and PSG; Right, B–A plots for SWA and PSG, Mean bias, middle horizontal line showing shift from zero; Limits of agreement (2 standard deviations of bias) as indicated by the dotted lines on either side of the mean bias line, SOL, WASO, TST are in minutes, SE in percentages, 
17 °C, 
22 °C and 
29 °C—temperature of the sleeping environment.
