Sleeping too little or too much may be bad for your heart.
Researchers followed 461-thousand British adults for seven years.
They found those who slept fewer than six hours or more than nine hours were more likely to have a heart attack.
That is compared to people who slept between six and nine hours every night.
And those who have a genetic predisposition to heart disease were able to lower that risk by 18-percent if they got six to nine hours of sleep.
In another health note, frequently eating nuts may be good for your heart.
Iranian researchers followed more than 54-hundred healthy adults for 12 years.
They found people who ate nuts at least twice a week were 17-percent less likely to die from heart disease.
That is compared to those who only ate nuts once every two weeks.