Being awakened during this stage can impact your mood. The first REM can last around 10 minutes, while the last can endure for up to an hour. The duration of this stage gets longer as we complete each sleep cycle. During this stage eyes move rapidly, your heart rate increases, you experience vivid dreams, and your arms and legs become paralyzed. Stage 4, or REM, is the final and the most active phase, with the brain wide awake. ![]() This stage can last 20 to 40 minutes and is difficult to wake up from, but if you do, you'll feel dizzy and disoriented. This is the stage in which the body and mind recover, body tissue is repaired, your body builds bone and muscle, your heart rate is at its slowest, and your brain waves slow even more. Stage 3, also known as NREM3, deep sleep or slow-wave sleep. If you're awakened during this stage, you may feel disoriented. This stage lasts 10 to 25 minutes and is more difficult to be awakened. The eye movement stops, and brain activity slows. In this phase, your body is more relaxed, and you may start to experience sensations such as floating and involuntary movements. This phase lasts between 1 to 7 minutes, and waking up is quite easy. You can fit five complete 90-minute cycles during that time. The eye movement slows down, and brain waves begin to slow down. Each cycle lasts 90 minutes on average, and the recommended sleep time for adults is 7-8 hours. You may experience involuntary muscle contractions and other random movements during this stage. Let's take a closer look at the peculiarities of each of these stages:
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