My HormonologyDo you feel your most energetic time of the day is in the morning, afternoon or evening? Your answer could be a clue to how long or short your monthly cycle is compared to other women, according to a recent study in the journal Chronobiology International.

What the researchers found: Women who feel revved in the morning or afternoon have slightly shorter menstrual cycles than women who reach their energy peak in the evening. And, women who don’t hit their stride till the afternoon tend to have menstrual bleeding that lasts significantly longer than morning and evening types.

Regardless of how short or long your cycle is or if it varies from month to month, you can still use the Hormone Horoscope to predict your day and plan your life. Just follow this handy hormonal road map that helps you pinpoint exactly where you are in your cycle right now.