Heart failure linked to insomnia: Norwegian study

The observational study followed 52,279 people aged 20 to 89 for a mean of 11.3 years, during which time 1412 were diagnosed with heart failure. 

Participants self-reported insomnia symptoms of difficulty falling asleep, staying asleep or having non-restorative sleep.

Those experiencing all three symptoms had a greater than threefold increased risk of developing heart failure compared to those with no symptoms. The risk of acute myocardial infarction increased by 85%.