Yes, humans do experience deep sleep, also known as slow-wave sleep. It's the third and fourth stages of non-REM sleep, characterized by a decrease in heart rate and breathing, as well as a drop in body temperature. During deep sleep, the body repairs and restores itself, strengthens the immune system, and consolidates memories. While we typically experience several sleep cycles throughout the night, deep sleep predominantly occurs in the first half of the night.
While deep sleep is essential for our health and well-being, the duration and quality of deep sleep can vary depending on factors such as age, health, and lifestyle.
