Men who jerked and flexed their legs involuntarily at night were more likely to develop cardiovascular disease in a new study of sleep and chronic disease in the 65-and-older age group.
So-called periodic limb movements are considered a different condition from restless leg syndrome (RLS). In contrast to restless legs, people with periodic limb movements often don't realise it, said Dr Brian Koo, the study's lead author from Case Western Reserve University School of Medicine in Cleveland, US. One clue, though, is sleepiness during the day as a result of many brief nighttime wake-ups. Sleep tests are needed to make the diagnosis, researchers said.