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Qualitas somnī plerumque mutatur transitū ā unō somnī gradū in alium. Quamquam signa transituī inter gradūs arcana sunt, hīs gradūs planē liberī sunt inter sē. Distinguentur ā exiguis mutationibus in munere [[corpus|corporis]] et omnē partē orbis praedictus cum notabilibus intervallīs. Medicī ūtor machinā scribendō somnō spectatum gradūs somnī. Haec machina colligit [[data]] de electricibus et musculosis statibus somnī.
 
Anno 1968 R<small>ECHTSCHAFFEN</small> et K<small>ALES</small> classificationem sequentem divulgaverunt<ref>{{cite journal |authors=Rechtschaffen A., Kales A. |title=A manual of standardized terminology, techniques and scoring system for sleep stages of human subjects |journal=National Institutes of Health Publications |year=1968 |volume=204}}, US Government Printing Office, Washington DC</ref>:
 
=== I. “Excitans” Gradus ===