sleep Flashcards

Circadian rhythms are the physical, mental, and behavioral changes an organism experiences over a 24-hour cycle. Light and dark have the biggest influence on circadian rhythms, but food intake, stress, physical activity, social environment, and temperature also affect them

a series of thoughts, images, and sensations occurring in a person's mind during sleep."I had a recurrent dream about falling from great heights"

The electroencephalogram (EEG) is a medical test used to measure the electrical activity of the brain. A number of electrodes are applied to your scalp. EEG can help diagnose a number of conditions including epilepsy, sleep disorders and brain tumours.

Diseases and conditions that can cause hypersomnia include epilepsy, hypothyroidism, encephalitis, multiple sclerosis, Parkinson's disease, obesity, obstructive sleep apnea, delayed sleep phase syndrome, multiple systems atrophy, myotonic dystrophy and other genetic disorders, mood disorders (including depression

Insomnia is a common sleep disorder. With insomnia, you may have trouble falling asleep, staying asleep, or getting good quality sleep. This happens even if you have the time and the right environment to sleep well. Insomnia can get in the way of your daily activities and may make you feel sleepy during the day.

Melatonin is a hormone that your brain produces in response to darkness. It helps with the timing of your circadian rhythms (24-hour internal clock) and with sleep. Being exposed to light at night can block melatonin production.

A midday nap can enhance alertness, mood, memory, and reduce stress. Choose a comfortable, quiet spot and time your naps well to avoid grogginess. The ideal nap length, between 20 and 30 minutes, should help you wake up feeling refreshed without falling into deep sleep.

What is narcolepsy? Narcolepsy is a chronic neurological disorder that affects the brain's ability to control sleep-wake cycles. People with narcolepsy may feel rested after waking, but then feel very sleepy throughout much of the day.

What are night terrors? Night terrors are a sleep disorder in which a person quickly awakens from sleep in a terrified state. The cause is unknown but night terrors are often triggered by fever, lack of sleep or periods of emotional tension, stress or conflict.

Overview. A nightmare is a disturbing dream associated with negative feelings, such as anxiety or fear that awakens you. Nightmares are common in children but can happen at any age. Occasional nightmares usually are nothing to worry about.

Parasomnias occur in a state that lies between sleep and wakefulness. A person with parasomnias may seem to be alert, walking or talking or eating or doing other such activities but without awareness because the brain is only partially awake.

The cause of RLS is still unknown. Some cases are believed to be inherited. Some cases have been linked with nerve damage in the legs from diabetes, kidney problems, iron deficiency, certain medicines, pregnancy, sleep disorders, and alcoholism.

Carskadon and Dement offer the following definition of sleep: “Sleep is a recurring, reversible neuro-behavioral state of relative perceptual disengagement from and unresponsiveness to the environment. Sleep is typically accompanied (in humans) by postural recumbence, behavioral quiescence, and closed eyes.”

Sleep apnea is a potentially serious sleep disorder in which breathing repeatedly stops and starts. If you snore loudly and feel tired even after a full night's sleep, you might have sleep apnea.

Summary. Read the full fact sheet. Sleep deprivation occurs when an individual fails to get the amount of sleep that they need. Sleep deprivation can occur due to various lifestyle, work and environmental factors. Sleep disorders and other chronic medical conditions can also cause sleep deprivation.

Sleep paralysis is a feeling of being conscious but unable to move. It occurs when a person passes between stages of wakefulness and sleep. During these transitions, you may be unable to move or speak for a few seconds up to a few minutes. Some people may also feel pressure or a sense of choking.

Polysomnography, known as a sleep study, is a test used to diagnose sleep disorders. Polysomnography records your brain waves, the oxygen level in your blood, and your heart rate and breathing during sleep. It also measures eye and leg movements.

Overview. Snoring is the hoarse or harsh sound that occurs when air flows past relaxed tissues in your throat, causing the tissues to vibrate as you breathe. Nearly everyone snores now and then, but for some people it can be a chronic problem.

Stage 1 NREM sleep is the first sleep stage you enter when nodding off. This sleep stage is when heartbeat, eye movements, brain waves, and breathing activity begin to taper down. Motor movements also diminish, although you may experience muscle twitches called hypnic jerks.

What is stage 2 NREM sleep? Stage 2 is still light sleep, but deeper than stage 1. During this stage, your brain waves slow down and have noticeable pauses between short, powerful bursts of electrical activity. Experts think those bursts are your brain organizing memories and information from the time you spent awake.

Stage 3 sleep is also known as N3 or deep sleep, and it is harder to wake someone up if they are in this phase. Muscle tone, pulse, and breathing rate decrease in N3 sleep as the body relaxes even further. The brain activity during this period has an identifiable pattern of what are known as delta waves.

Stage 4 is an even deeper sleep where the brain waves further slow and sleepers are very difficult to wake. It's believed that tissue repair occurs during the stage of sleep and that hormones are also released to help with growth.

walk around and sometimes perform other actions while asleep."apparently, people who sleepwalk often make for the wardrobe"

Wakefulness is a daily recurring brain state and state of consciousness in which an individual is conscious and engages in coherent cognitive and behavioral responses to the external world. Being awake is the opposite of being asleep, in which most external inputs to the brain are excluded from neural processing.