11/12/2025
REM sleep typically begins within 90 minutes of a person falling asleep and cycles every 90 minutes. During REM sleep, the body and brain go through several changes, including:
😴 rapid movements of the eyes
😴 fast and irregular breathing
😴 increased heart rate (to near waking levels)
😴 changes in body temperature
😴 increased blood pressure
😴 brain activity (similar to waking levels)
😴 increased oxygen consumption by the brain
😴 twitching of the face and limbs
Learn more about REM and other stages of sleep: https://www.medicalnewstoday.com/articles/247927 -is-it