Check your biorhythm
Biorhythm or biological rhythm is a cyclic pattern of changes in physiology or in activity of living organisms, often synchronized with daily, monthly, or yearly environmental changes. Rhythms that vary according to the time of day (circadian rhythms), in part a response to daylight or dark, include the opening and closing of flowers and the nighttime increase in activity of nocturnal animals.
Biorhythm charts illustrate the principle that we are influenced by physical, emotional, and intellectual cycles. It is reported that you can improve the quality of your life by monitoring the highs and lows of these cycles and acting accordingly.