"Restless Legs"
Not me but I've seen it. The previous person smoke and drank coffee a lot, which I suspected contributed. Unfortunately people who are addicted to cigarettes and caffeine will argue strongly that their addictions have no ill effects and will refuse to stop.
http://www.restlesslegs.org.uk/
http://www.embarrassingproblems.co.uk/restlesslegs.htm
http://www.restlesslegs.com/
One says "No one knows what causes restless legs, but researchers think it is probably due to a lack of availability of dopamine (a chemical transmitter) in a small area of the brain or spinal cord, rather than a problem in the legs themselves.
In three-quarters of sufferers, the tendency to restless legs is inherited.
In a few people (usually elderly), it is due to a shortage of iron.
Some people have restless legs only when they are pregnant or find that pregnancy worsens it.
Sometimes a similar feeling occurs in people who have illnesses that affect small nerves in the skin (such as diabetes or rheumatoid arthritis).
Stress, fatigue, smoking, caffeine and alcohol can all make it worse.
Some medications (for example, antidepressants and calcium channel blocker drugs for blood pressure) can cause or worsen restless legs. "
Another says:
"There is evidence from large study groups in the US and Europe that suggest that RLS is associated with a higher body-mass index, lower income, smoking, lack of exercise, low alcohol consumption and diabetes mellitus. Women may be affected marginally more often than men and the disorder may have different frequencies in different ethnic and national groups. Recent evidence suggests a higher incidence amongst patients with somatic complaints (including cardiac problems and hypertension) and it is hypothesised in those with neuropsychiatric symptoms."