And, women should wait till 6 PM to ask for something from a man, as this is the time when a male is likely to grant a loved one's wishes, according to the study, based on a poll of more than 1,000 men and women in Britain.
When it comes to asking for a pay rise or promotion, a woman would do best not to pounce on the boss when he or she arrives for work in the morning, but to wait until 1 PM, the study has suggested.
This is the time that managers are likely to be most receptive to employees' demands, according to the findings.
Women, however, will be glad to know that they are not the only sex affected by "mood swings", with the male mindset also changing over the course of the day. Some 86 per cent of the 1,019 men and women polled said they were aware of regular peaks and troughs in their mood, the 'Daily Mail' reported.
But, perhaps not surprisingly, less than half of these had even thought of capitalising on the phenomenon.The findings suggest that by being more in touch with biorhythms, or the body's natural rhythms, people can get what we want more often. Mood can be affected by hormones including those in contraceptives as well as stress, food and alcohol.
Commenting alongside pharmaceutical giant Bayer's poll, Evie Bentley, a psychotherapist with a special interest in biorhythms, said: "Each biorhythm cycle is regulated by the brain which controls what hormones and how much of each are produced in order to balance bodily functions."A great deal of how one feels physically, emotionally and intellectually is caused by their biorhythms.