Abstract
Background and objective As compared to preceding wakefulness, stage 1 sleep is characterized by elevated slow-wave activity (SWA) that is regarded as the most popular electroencephalographic (EEG) indicator of sleep debt. However, some other indicators did not suggest such elevation until stage 2 sleep. In this paper, a more direct indicator of the signature left by sleep debt in the sleep EEG spectrum named “spectral sleep debt component score” (SDS) was introduced, and its changes throughout three stages of non-rapid eye movement (NREM) sleep were studied.
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