which statement best describes the circadian rhythm? which statement best describes the circadian rhythm? in a 24-hour period of time, we spend a period of time awake and a period of time asleep. in a 24-hour period of time, we feel the most awake after eating breakfast. in a 24-hour period of time, adults require at least 8 hours of sleep to feel rested. in a 24-hour period of time, we feel most sleepy during brightest period of the day.