Energy depleted state and slow energy regeneration. Your body is in fatigued state and resting metabolism is dialed down by down regulating your thyroid. This causes many problems. One of which is increased inflammation and increased stress hormones, of which serotonin is one. Serotonin is known to cause insomnia and restless sleep and restless leggs. Estrogen is another stress hormone that is increased significantly in stressed or overtrained men and woman. Estrogen combine with PUFA's in your system to cause or contribute to, and accelerate many of today's degenerative diseases. You could also have a sodium (salt) deficiency wich leads to an excess aldosterone hormone which try to prevent further sodium loss, but at the expense of magnesium and calsium loss. So in short a mineral deficiency as well. My advice (imho and for whats it worth) , rest, rest more and eat plenty of sugar, calsium, milk, salt and protein, and get your thyroid checked out. Insomnia, worry and "restless legs" at bedtime are problems for many old people, and I think they are variations of the basic energy-depletion problem. In the hormonal environment dominated by estrogen, mild stresses such as exertion, or even restless sleep, allow toxins (and sometimes bacteria) from the intestine to enter the bloodstream, triggering a complex chain of events that create a systemic inflammatory state. Although these processes have been observed in many simple experiments, their implications are almost always neglected or denied or explained away. Incorporation of certain polyunsaturated fats into the tissues increases the leakiness of blood vessels, and amplifies the reactions to stresses and inflammatory stimuli. Antioxidants, thyroid hormone, progesterone, and antiinflammatory agents, including glycine or gelatin, niacin, and saturated fats, can prevent, and in many cases reverse, these degenerative inflammatory processes. Most of the facts are known, but they have seldom been put together in meaningful patterns, which would let us see that a few simple principles govern a great range of disturbing phenomena: seizures, shock, hypertension, fibrillation, cramps, restless legs, coma, insomnia, obsessive thinking, migraine, hyperactivity, even cell death and aging.”