These 8 signs will warn you a month before a heart attack

Insomnia

Insomnia is also linked with an increased risk of heart attack or stroke - and is more common among women. Symptoms include difficulty initiating sleep, difficulty maintaining sleep, and early-morning awakening. Experts have previously found significant associations between insomnia and heart attack risk.

Researchers in China, reporting in the journal Neurology, found that people who had three types of insomnia symptoms were 18 per cent more likely to have a heart attack or stroke.