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Background
Human Brain produces several waveforms that can be used to differentiate sleep stages, these waveforms have distinct patterns recognized by a specific rhythm like delta, theta, alpha, beta, and spindles. These waveforms are continuous bioelectrical cerebral oscillations without intervals. Some rhythms are physiologic and others are pathological. Rhythms can be focal, widely scattered, or generalized and synchronous. Based on the recommendations by the R&K module, Sleep is evaluated per each 30 sec which is known as an epoch. Sleep stages (W, S1, S2, S3, S4, REM) should be assigned per each epoch following the rules in the manual of scoring sleep stages.
