{| class="wikitable" |+ !Use this word: !Not these: |- |Mechanism |Mechanics, Function, Workings |- |Schedule |Timetable, Sleep cycle, Sleep program, Rhythm, Program |- |Adaptation |Adjustment |- |Variant |Variation, Version, Option |- |'''Extended/shortened''' sleep schedule |'''Lengthened/compressed''' sleep schedule |- |'''Lengthened/compressed''' sleep cycle |'''Extended/shortened''' sleep cycle |- |Everyman '''1/2/3/4''' (nap count) |Everyman '''6/4.5/3/1.5''' (core length) |}