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[[File:DC1-30m.png|thumb|30min naps and shortened cores]]
These variants are derived from [[Special:MyLanguage/Triphasic|Triphasic]], and have significantly less total sleep than standard DC1. They extend the night and morning cores, while shortening the daytime core of Triphasic to a 30m nap for ease of scheduling. Both attempts and adaptations have been rare, possibly because of the uncommon core lengths leading to difficult wakes.