Fatigue is often a major contributor to low libido. If the body feels that is does not have the strength to get through the day at an optimal level, it will begin to ration its energy. On a biochemical level, fatigue and stress drive certain hormones, like DHEA and testosterone, down. Though these are often considered male hormones, they are also found and needed in females (in lesser amounts). Low levels of testosterone and DHEA can be replaced to help raise libido [Source: Sherwin].
DHEA can be taken orally and is available over-the-counter. Testosterone is available by prescription and is typically given to women as a cream. Both of these hormones may be low in women well before menopause has started. They can be checked through blood, urine or saliva testing. For many, replacement with DHEA and other hormones can also improve sleep and improve mood, both of which provide a natural boost to libido.
Hormone replacement. One may also want to consider the replacement of estrogen and progesterone. This is not always an easy decision, but you may want to consider the benefits of bioidentical hormones.