Last night's episode of Cougar Town, "Into the Great Wide Open", toyed with the cliched notion that once women hit a certain age, they begin to realize that they're "prime" is long gone.
Although many people don't realize this, an imbalance in your hormones could be to blame when you're unable to count sheep. Often, in women, as a result of an estrogen deficiency, which is common in perimenopause and menopause, your ability to get a full night's sleep suffers. This is due to the fact that estrogen is a sleep-maintaining hormone. Conversely, in men, insomnia is generally a result of low testosterone levels.