Table 2. Intraclass Correlation Coefficient (ICC) and 95% confidence intervals for the ICC for average, minimum and maximum heart rates for the three sessions for each of the ten subjects. The data are divided into sleep and daytime. Variables ICC for Sleep (95% C.I.) ICC for Day Time (95% C.I.) Average Heart Rate 0.91 (0.76 – 0.97) 0.73 (0.41 – 0.92) Minimum Heart Rate 0.92 (0.79 – 0.98) 0.79 (0.52 – 0.94) Maximum Heart Rate 0.55 (0.17 – 0.84) 0.84 (0.61 – 0.95)