Why do I get so tired the week before my period?

Written by lindsay kahl
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Why do I get so tired the week before my period?
Your hormones have a major effect on energy levels. (woman sleeping image by forca from Fotolia.com)

Each woman's body contains hundreds of different kinds of hormones, and three play a major part during the menstrual cycle. The levels of testosterone, oestrogen and progesterone go up and down throughout your cycle, and this has a major effect on how your body functions.

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Progesterone

In the week before your period, the level of progesterone in your body rises. Progesterone has a sedating effect, which may make you feel listless and fatigued.

Oestrogen

During this time in your cycle, oestrogen levels decrease. Declining oestrogen levels lead to bursts of another hormone called noradrenaline, which can keep you from reaching REM sleep.

Testosterone

Testosterone levels also decline leading up to your period, lowering energy and endurance.

Sensitivity

At this point in your cycle, you are more sensitive to sounds, smells, and pain, which may have an effect on your sleep patterns.

Tips

Try using a fan or sound machine during the night to block out distracting sounds. Even though you're tired, try to avoid caffeine; it can make premenstrual symptoms worse.

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