Wearable fitness trackers provide sleep data that can give you insights about the duration and quality of your sleep. A doctor explains which metrics matter the most, and how to use the data to ...

Based on testing done by our sleep experts and headphone expert, these are the best headphones and earbuds for sleep.

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. The Apple Watch has a ...

Social memory—the ability to recognize familiar individuals and distinguish them from strangers—is fundamental to social cognition.