Fresh from a Google search: The thyroid is a butterfly-shaped gland you can feel at the base of your neck, just below your Adam's apple. Two lobes (the "wings" of the butterfly) fit on either side of your windpipe. Impairment of thyroid function affects about 2% of adult women and about 0.1% to 0.2% of adult men in North America.
These are just some of the many symptoms I found -
-decreased interest in daily activities
-reduced sexual interest.
Aha! Perhaps this is the explanation about why I have had insomnia for 4 years now. Damn you, thyroid!