How Much Deep Sleep Do You Need? - Sleep Foundation Deep sleep gives your body a chance to repair and recover and leaves you refreshed in the morning Learn how much deep sleep you need and how to get more
Best Sleep Trackers of 2025: Data That Matters Sleep trackers provide tailored insights into how well you’re sleeping Our testing team tried out dozens of models to find the best tech for you
Dr. Matthew Walker - Sleep Foundation Matthew Walker, Ph D , is professor of neuroscience and psychology at the University of California, Berkeley, and founder and director of the school’s Center for Human Sleep Science