Figure 6.

(a) EEG signal of F4-C4 channel for S3 sleep class. (b–f) Sub-band signals or rhythms ($\delta$-wave, $\theta$-wave, $\alpha$-wave, $\beta$-wave, and $\gamma$-wave) of EEG signal extracted using MPFBEWT for S3 sleep class. (g) EEG signal of F4-C4 channel for S4 sleep class. (h–l) Sub-band signals or rhythms of EEG signal extracted using MPFBEWT for S4 sleep class. (m) EEG signal of F4-C4 channel for REM sleep class. (n–r) Sub-band signals or rhythms of EEG signal extracted using MPFBEWT for REM sleep class.