First it was Microsoft cofounder Bill Gates, who got the Internet all fired up when he answered questions in a Reddit AskMeAnything thread. I am in the camp that is concerned about super intelligence, Gates wrote in response to a question about the existential threat posed by artificial intelligence (AI). First, the machines will do a lot of jobs for us and not be super intelligent.
A normal heart rate is between 60-100 beats per minute at rest (sitting, relaxing, etc.). It is well-known that the average resting heart rate for well-trained athletes is 40-60 beats per minute! However, this rate can change dramatically while sleeping or with daily activity and exercise.
According to the American Heart Association, a normal resting heart rate is 60 to 80 beats a minute, or about one beat per second. Well-trained athletes sometimes have resting heart rates as low as 40 beats per minute, but for those who exercise only casually or not at all, a heart rate this low is not normal. It is best to take your heart rate before you get out of bed after a night of sound sleep.