She's a certified sleep science ... The below chart from UCSF Benioff Children’s Hospital outlines the normal range of beats per minute for resting heart rate, based on age.

View this interactive chart on Fortune.com Smartwatches and other fitness trackers are great for people seeking detailed, long-term data about their resting heart rate, but high-tech gadgets are ...

so it only makes sense that your heart rate declines during sleep, Dr. Brager says. Everyone's daytime resting heart rate is different, so everyone's sleeping heart rate will differ, too.

According to Harvard Medical School, a normal resting heart rate is anywhere between 60 and 100 beats per minute. However, for most healthy adults it actually falls between 55 and 85 beats per ...

A person’s resting heart rate can also drop during deep sleep. Additionally, a slow resting heart rate can be a result of certain health conditions. Bradycardia refers to a slow resting heart ...

You probably were told your resting heart rate at your last checkup. Or maybe you get alerts throughout the day thanks to a fitness tracker or smart watch. But what does the number really mean? And ...