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[[File:Segmented-extended.png|right|thumb|Non-reducing Segmented variants]]The difference between [[Special:MyLanguage/Segmented|Segmented]]-extended and non-reducing Segmented is that the former has a fixed duration and can reduce some sleep for long sleepers, whereas the latter aims not to reduce any sleep (e.g, 4.5-4.5h cores for a 9-hour sleeper). The non-reducing variant is believed to resemble the historical sleep pattern in pre-industrial Europe. Both variants, however, occupy much of the evening and the morning, which can clash with social commitments.
