sadfaceNot happy with work, school or your usual weekday routine–and the idea of returning to it on Monday is making you blue or irritable? If so, not only do you have a bad case of “The Mondays”, chances are, you’re also in the second half of your cycle.

That’s the word from a 2004 study in the Journal of Psychosomatic Research that shows lower levels of estrogen combined with progesterone on these days make you more prone to anger, rumination, anxiety, stress and fatigue during work, school or your weekday routine if you’re already unhappy with it.

However, if you enjoy what you do Monday through Friday, you’re likely to continue being happy with it despite these hormonal changes.

You know what this means, right? Once you get the job you love, switch to a different school or change your weekday routine–or make tweaks to your current job, school or routine to make it more enjoyable–you’ll actually look forward to doing it all cycle long.

So, if you’re unhappy at work, school or with your weekday routine right now, this sounds like a good reason to start making a positive change today.