Fig. 4:
On-bed periods estimation; (a) The mean (among 16 sensors) amplitude, 6:14-6:24 pm., (b) CWT analysis, 6:14-6:24 pm., (c) Comparing the PSDs for two windows before and after laying on the mattress, (d) The mean amplitude, 10:02-10:13 pm., (e) CWT analysis, 10:02-10:14 pm., (f) The whole raw signal (during “not using the bed” and “On-bed” times) recorded over the first night.