体内時計 biologic(al) clock●biologic(al) timekeeper●body's internal clock●body('s) clock●circadian clock●inner clock / interior clock [watch]〈まれ〉●internal clock〈まれ〉

体内時計は目に入る光から合図を受ける The body clock takes its cue from light entering the eyes.

体内時計をゼロに戻す reset the sleep clock

体内時計をリセットする reset the biologic(al) clock●reset the sleep clock

体内時計を合わせ直す reset one's body [internal] clock

体内時計を正す put one's biologic(al) clock in order

体内時計を太陽時と合わせる synchronize one's body clocks with solar time