A new survey has found that women are more likely to have their wishes granted if they make their wish at 6 pm.
Wishes can range from taking out the rubbish to a romantic weekend away.
However, the poll of more than 1,000 men and women suggests that henpecked husbands should steer clear of having a row mid-afternoon -because 3pm is the best time for the fairer sex to win an argument.
According to the poll carried out for pharmaceuticals giant and contraceptives manufacturer Bayer Schering Pharma, 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 1pm.
This is the time that managers are likely to be most receptive to employees' demands.
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.
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, we could get what we want more often.
Mood can be affected by hormones, including those in contraceptives as well as stress, food and alcohol.
"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," the Daily Mail quoted Evie Bentley, a psychotherapist with a special interest in biorhythms, as saying.
"A great deal of how a person feels physically, intellectually, and emotionally, is caused by their biorhythms.
"For example, the hormones in our bodies can affect our moods. It is important to choose the right contraceptive option for you to ensure you are in tune with yourself, to complement your natural rhythms."