Figure 8.

Sleep stage detection and assessment results based on proposed LSVM model

8 h of raw ECG signal was obtained and used in experiments (class 1: deep sleep; class 2: light sleep).

(A), (B), (C), (D), (E), (F), (G), and (H) refer to the detection and assessment results of sleep stages for each hour within 8 h, respectively. In every figure, the blue-green area contains class 1, and the purplish red area contains class 2. The size of different colored areas represents the proportion of different sleep stages during that time period.