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What are the names of the stages of sleep?
During sleep, we usually pass through five phases of sleep. These stages progress in a cycle from stage 1 to rapid-eye-movement (REM) sleep, then the cycle starts over again with stage 1. We spend almost 50 percent of our total sleep time in stage 2 sleep, about 20 percent in REM sleep, and the remaining 30 percent in the other stages. Infants, by contrast, spend about half of their sleep time in REM sleep. During stage 1, which is light sleep, we drift in and out of sleep and can be awakened easily. Our eyes move very slowly and muscle activity slows. People awakened from stage 1 sleep often remember fragmented visual images. Many also experience sudden muscle contractions called hypnic myoclonia, often preceded by a sensation of starting to fall. These sudden movements are similar to the "jump" we make when startled. When we enter stage 2 sleep, our eye movements stop and our brain waves (fluctuations of electrical activity that can be measured by electrodes) become slower, with occasional bursts of rapid waves called sleep spindles. In stage 3, extremely slow brain waves called delta waves begin to appear, interspersed with smaller, faster waves. By stage 4, the brain produces delta waves almost exclusively. It is very difficult to wake someone during stages 3 and 4, which together are called deep sleep. There is no eye movement or muscle activity. People awakened during deep sleep do not adjust immediately and often feel groggy and disoriented for several minutes after they wake up. Some children experience bedwetting, night terrors, or sleepwalking during deep sleep. When we switch into REM sleep, our breathing becomes more rapid, irregular, and shallow, our eyes jerk rapidly in various directions, and our limb muscles become temporarily paralyzed. Our heart rate increases, our blood pressure rises, and males develop penile erections. When people awaken during REM sleep, they often describe bizarre and illogical tales - dreams. The first REM sleep period usually occurs about 70 to 90 minutes after we fall asleep. A complete sleep cycle takes 90 to 110 minutes on average. The first sleep cycles each night contain relatively short REM periods and long periods of deep sleep. As the night progresses, REM sleep periods increase in length while deep sleep decreases. By morning, people spend nearly all their sleep time in stages 1, 2, and REM. People awakened after sleeping more than a few minutes are usually unable to recall the last few minutes before they fell asleep. This sleep-related form of amnesia is the reason people often forget telephone calls or conversations they've had in the middle of the night. It also explains why we often do not remember our alarms ringing in the morning if we go right back to sleep after turning them off1.1. http://healthjournal.upmc.com/0205/SleepPhases.htm
How long can a drop of water spend in the ocean?
a drop of water may spend over 3,000 years in the ocean before moving on to another part of the water cycle
What plants have a prothallus that forms archegonia and antheridia and has a dominant sporophyte?
Ferns are plants that have a prothallus with archegonia and antheridia. In ferns, the sporophyte generation is dominant, meaning it is the more visible and long-lived stage of the plant's life cycle compared to the gametophyte stage.
How does the black hole stage transitions into the next stage?
Basically there is no "next stage". Well, it is believed that a black hole will evaporate, but that will take a long, long time.
Do bacteria sleep?
Not in the same way we do. Most don't live long enough for sleep to be effective, some go through regular periods of inactivity like we do, but because they don't have brains, they don't dream or anything like that, and pretty much all can go into long periods of hibernation when they get cold.
How long does each stage of a butterfly life cycle last?
how long does the Ulysses butterfly spend in each stage
What stage does the cell spend most if its time in the cell cycle?
Interphase, which is the first stage in the cell cycle
Is there a sequel to the book a long long sleep?
There will be. It is still in the editing stage.
Which stage of sleep is marked by long slow delta brain waves?
Stage 4. apex:)
How long is the average sleep cycle?
Around 90-110 minutes for adults and in children it's about 45 minutes.
How long is a typical sleep cycle in which a sleeper progresses through some or all of the sleep stages?
90
How long do Ant sleep?
ants do not sleep as they spend their time looking for food as they have the second smallest brain in the world
How long do people sleep in years?
If you sleep an average of 8hrs a day and live 80 yrs, you would spend 26.4 asleep.
How long do typical sleep cycles last?
It depends on the person, and the sleep, but the first stage averages at about 90 minutes, with stages 2-4 taking on average 100-120 minutes. The cycle generally proceeds from NREM (non-REM) stages 1-3 to REM (stage 4), back down to NREM, and back to REM, several times a night, generally ending in an REM stage before awakening.
What are the names of the stages of sleep?
During sleep, we usually pass through five phases of sleep. These stages progress in a cycle from stage 1 to rapid-eye-movement (REM) sleep, then the cycle starts over again with stage 1. We spend almost 50 percent of our total sleep time in stage 2 sleep, about 20 percent in REM sleep, and the remaining 30 percent in the other stages. Infants, by contrast, spend about half of their sleep time in REM sleep. During stage 1, which is light sleep, we drift in and out of sleep and can be awakened easily. Our eyes move very slowly and muscle activity slows. People awakened from stage 1 sleep often remember fragmented visual images. Many also experience sudden muscle contractions called hypnic myoclonia, often preceded by a sensation of starting to fall. These sudden movements are similar to the "jump" we make when startled. When we enter stage 2 sleep, our eye movements stop and our brain waves (fluctuations of electrical activity that can be measured by electrodes) become slower, with occasional bursts of rapid waves called sleep spindles. In stage 3, extremely slow brain waves called delta waves begin to appear, interspersed with smaller, faster waves. By stage 4, the brain produces delta waves almost exclusively. It is very difficult to wake someone during stages 3 and 4, which together are called deep sleep. There is no eye movement or muscle activity. People awakened during deep sleep do not adjust immediately and often feel groggy and disoriented for several minutes after they wake up. Some children experience bedwetting, night terrors, or sleepwalking during deep sleep. When we switch into REM sleep, our breathing becomes more rapid, irregular, and shallow, our eyes jerk rapidly in various directions, and our limb muscles become temporarily paralyzed. Our heart rate increases, our blood pressure rises, and males develop penile erections. When people awaken during REM sleep, they often describe bizarre and illogical tales - dreams. The first REM sleep period usually occurs about 70 to 90 minutes after we fall asleep. A complete sleep cycle takes 90 to 110 minutes on average. The first sleep cycles each night contain relatively short REM periods and long periods of deep sleep. As the night progresses, REM sleep periods increase in length while deep sleep decreases. By morning, people spend nearly all their sleep time in stages 1, 2, and REM. People awakened after sleeping more than a few minutes are usually unable to recall the last few minutes before they fell asleep. This sleep-related form of amnesia is the reason people often forget telephone calls or conversations they've had in the middle of the night. It also explains why we often do not remember our alarms ringing in the morning if we go right back to sleep after turning them off1.1. http://healthjournal.upmc.com/0205/SleepPhases.htm
What is slow-wave sleep?
Slow wave sleep occurs after Stage 1 and Stage 2 sleep, and prior to REM sleep. There is more slow wave sleep present toward the beginning of the night, while more REM sleep is present toward the end of the night's sleep. In slow wave sleep, delta waves are present on the EEG (Electroencephalogram), which measures brain activity. These waves are long and slow, as opposed to the sharp waves of Stage 2 sleep. It is ecause of the shape of these waves that the stage is called slow wave sleep.
Does a skin cell have a long G1 stage?
No, a skin cell typically undergoes a shorter G1 stage compared to other cell types because it has a quicker turnover rate. Skin cells are constantly dividing and being replaced, so they spend less time in the G1 phase of the cell cycle.
