Lower sleep duration is correlated with a higher resting heart rate, and a high resting heart rate can negatively impact sleep quality.

“Higher bedtime heart rate is generally associated with worse sleep outcomes, including reduced slow-wave (deep) and REM sleep, fragmented sleep with more awakenings, and poorer subjective sleep satisfaction.”

“In practice, a healthy routine that results in a low pre-sleep HR will usually improve sleep, but focusing on overall lifestyle and environment is crucial since causation is indirect.”

“Lower bedtime heart rate often correlates with better sleep – more deep sleep and REM, higher sleep efficiency, fewer awakenings, and higher self-rated sleep quality.”

“Bedtime resting heart rate can be a useful predictor of sleep quality – many wearable datasets and experiments support its predictive power. However, it should be considered alongside other factors. It is one important variable rather than the sole determinant of sleep quality.”

“Your resting heart rate just before bed is, in my experience, the most powerful predictor of my sleep quality.”

“My resting heart rate before bed is the strongest predictor of sleep quality.”

“The most powerful predictor of sleep quality is resting heart rate before sleep.”

“Total amount of sleep is actually correlated. So the less sleep you get, the higher your resting heart rate. They're actually like they um so they're they're cross-correlated right? Like if your resting heart rate's too high, you're not going to get good sleep. And if you're not getting enough sleep, then your resting heart rate is going to be high.”