https://www.sleepfoundation.org/stages-of-sleep/rem-sleep
REM sleep is characterized by relaxed muscles, quick eye movement, irregular breathing, elevated heart rate, and increased brain activity. Most adults need about two hours of REM sleep each night. REM sleep plays a role in memory consolidation, emotional processing, brain development, and dreaming.

https://www.nytimes.com/2023/02/25/well/mind/rem-sleep-benefits.html
After that, REM sleep begins, and your heart rate, breathing and brain activity all increase. Brain regions involved in processing emotions and sensory input (from your dream world) light up

https://www.thensf.org/what-is-rem-sleep/
Sleep is generally divided into two stages: REM (rapid eye movement) and NREM (non-rapid eye movement). NREM is further split into three parts: starting to fall asleep, light sleep, and deep sleep. During deep sleep, your breathing slows down, your blood pressure drops, and your energy is renewed. During a typical night, your sleep alternates

https://www.healthline.com/health/healthy-sleep/how-to-get-more-rem-sleep
Develop a sleep schedule. Go to bed and wake up at the same time every day. This primes your body for sleep and waking. Don't drink caffeine or smoke cigarettes later in the day. These are

https://www.mayoclinic.org/diseases-conditions/rem-sleep-behavior-disorder/symptoms-causes/syc-20352920
The disorder often worsens with time. Symptoms of REM sleep behavior disorder may include: Movement, such as kicking, punching, arm flailing or jumping from bed, in response to action-filled or violent dreams, such as being chased or defending yourself from an attack. Noises, such as talking, laughing, shouting, emotional outcries or even cursing.

https://www.verywellhealth.com/the-four-stages-of-sleep-2795920
As your body progresses through the four sleep cycle stages—stages 1 through 3 (non-rapid eye movement, or NREM) and stage 4 (rapid eye movement, or REM), it transitions through different biological processes that affect your temperature, breathing, cells, and muscles. All the while, your brain is busy forming, organizing, and storing memories.

https://www.scientificamerican.com/article/what-happens-in-the-brain-during-sleep1/
Sleep serves to reenergize the body's cells, clear waste from the brain, and support learning and memory. It even plays vital roles in regulating mood, appetite and libido. Sleeping is an integral

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5846126/
Unlike waking movements, REM sleep twitches occur against a background of muscle atonia, thereby allowing the central nervous system to more effectively monitor the specific origins of each muscle twitch on the basis of a greater signal-to-noise ratio [ 62, 64, 65 ].

https://www.verywellhealth.com/what-is-rem-sleep-5085353
Function. Testing Relevance. Associated Conditions. Rapid eye movement (REM) sleep is one of the two recognized types of sleep. It is differentiated from non-REM sleep by vivid dreams, paralysis of most of the body's muscles, and preserved movement of the eyes and diaphragm. It occurs at intervals of 90 to 120 minutes throughout the night and

https://www.ninds.nih.gov/health-information/public-education/brain-basics/brain-basics-understanding-sleep
Stage 3 non-REM sleep is the period of deep sleep that you need to feel refreshed in the morning. It occurs in longer periods during the first half of the night. Your heartbeat and breathing slow to their lowest levels during sleep. Your muscles are relaxed and it may be difficult to awaken you. Brain waves become even slower.

https://www.medicalnewstoday.com/articles/what-happens-in-the-brain-when-you-sleep
According to the National Institute of Neurological Disorders and Stroke (NINDS), REM occurs about 90 mins after falling asleep. REM sleeps lasts roughly 10 minutes the first time, increasing with

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8761080/
CONCLUSION. Until recently, sleep experts assumed that the transmitters histamine, norepinephrine, and serotonin worked together to regulate arousal and became inactive during REM sleep to keep the body from acting out dreams. In fact, each of these neurotransmitters plays a distinct role in the sleep-wake cycle.

https://my.clevelandclinic.org/health/diseases/24465-rem-sleep-behavior-disorder-rbd
REM sleep behavior disorder (RBD) is a condition in which you physically and/or vocally act out your dreams while in the rapid eye movement (REM) stage of sleep. You're unaware of your actions while you're asleep. RBD is a parasomnia, which is a sleep disorder that involves unusual and undesirable physical events or experiences that disrupt

https://www.sciencedirect.com/science/article/pii/S0168010222002991
4. Conclusion. Various functional roles of REM sleep have been proposed, including the replay of activities experienced in the awake state, modulation of neural activity, synaptic regulation, memory processing, psychological function, and developmental function ( Fig. 3 ).

https://www.ncbi.nlm.nih.gov/books/NBK534239/
Rapid eye movement (REM) sleep behavior disorder (RBD) is a REM sleep parasomnia characterized by dream enactment during sleep.[1] Patients act out during their dreams while being in the REM stage of sleep. Clinical features during sleep include abnormal vocalizations, abnormal motor behavior, and altered dream mentation. This enactment may be violent and can lead to injury to themselves or

https://www.health.harvard.edu/healthbeat/how-sleep-boosts-your-energy
Sleep specialists believe that the last of them—known as deep sleep or slow-wave sleep—is the main time when your body renews and repairs itself. This stage of sleep appears to be the one that plays the greatest role in energy, enhancing your ability to make ATP, the body's energy molecule. In deep sleep, blood flow is directed less toward

https://www.livescience.com/how-sleep-affects-the-brain
During sleep, your brain waves become slower and the body cools. Secretions of melatonin, the hormone responsible for sleep, also rise. Meanwhile, wake-promoting neurotransmitters subside and

https://en.wikipedia.org/wiki/Rapid_eye_movement_sleep
A sample hypnogram (electroencephalogram of sleep) showing sleep cycles characterized by increasing paradoxical (REM) sleep EEG of a mouse that shows REM sleep being characterized by prominent theta-rhythm. Rapid eye movement sleep (REM sleep or REMS) is a unique phase of sleep in mammals (including humans) and birds, characterized by random rapid movement of the eyes, accompanied by low

https://www.ncbi.nlm.nih.gov/books/NBK11121/
In more recent studies of dreams, about 65% are associated with sadness, apprehension, or anger; 20% with happiness or excitement; and, somewhat surprisingly, only 1% with sexual feelings or acts. Adding to the uncertainty about the purposes of REM sleep and dreaming is the fact that deprivation of REM sleep in humans for as much as two weeks

https://www.verywellmind.com/understanding-dreams-2224258
Stage 1: This is the first stage of NREM sleep that involves the process of falling asleep. The body becomes more relaxed during this period of sleep, and brain activity begins to slow. This stage is very brief, lasting around five minutes. Stage 2: During this stage of sleep, body activity and brain waves slow.

https://www.healthline.com/health/sleep/dream-cycle
First, a quick rundown on the stages of sleep. Sleep happens in two main stages. There's rapid eye movement (REM) sleep and non-rapid eye movement (NREM) sleep. Experts have further split NREM

https://www.health.harvard.edu/blog/want-to-improve-your-memory-get-a-good-nights-sleep-2021040222255
Melatonin isn't a traditional sleeping pill, but it can help regulate your sleep cycle if that's the problem. Acetaminophen can relieve little aches and pains that can keep you up at night. All other sleeping pills, however, whether prescription or over the counter, sedate you and actually make your memory worse, both for what you learned

https://www.mayoclinic.org/diseases-conditions/rem-sleep-behavior-disorder/diagnosis-treatment/drc-20352925
Medications. Examples of treatment options for REM sleep behavior disorder include: Melatonin. Your doctor may prescribe a dietary supplement called melatonin, which may help reduce or eliminate your symptoms. Melatonin may be as effective as clonazepam and is usually well-tolerated with few side effects. Clonazepam (Klonopin).