Sleeping is divided into 4 stages(former 5).
Deep sleep or Slow-Wave Sleep is in stage 3.
Depending on your age the amount you are in every stage and total sleep time vary. A healthy adult will need 7-8 hours of sleep every night. While sleeping you will go through the stages like this:
1 - 2 - 3 - 2 - 4
5% - 25% - 20% - 25% - 25%
24m. - 2h. - 96m. - 2h. - 2h.
Deep Sleep is believed needed to contain new memories for the future. This is also the stage were your brain "reset" from the days tasks and duties.
NREM = None Rapid Eye Movement sleep
REM = Rapid Eye Movement sleep
You need 8 hours of sleep, and you have to be in deep sleep at 1-4 a.m.
Brown bears do not fall into a deep sleep. That is a false cartoon outlook on bears hibernating. Bears sleep nightly like humans, and do not need hibernation.
3/13/2012 jhh: REM sleep is NOT deep sleep. In fact, it is the lightest stage of sleep. In order from awake to deep sleep: AWAKE, REM, LIGHT, DEEP. Deep sleep and REM sleep are the most important stages though. Light sleep doesn't do much for you. Deep replenishes your body, while REM replenishes your mind. Older answer (not accurate): Yes. It is the deeper form of sleep that we experience during our sleep cycle, rem sleep is where dreaming occurs But not the deepest sleep, which would be delta. That's where, unless your a mother and hear your baby cry, you are oblivious to your environment.
you fall in a deep sleep.
My doctor has told me that tweens need 9 hours of sleep a night! A Sleep Doctor should tell you to sleep 10 hours of sleep not 9 hours. Now Adult can sleep up to 6 hours, there bodys don't need that much sleep:)
they sleep a little then swim a bit then sleep again is the water too deep they do have shallow spots and things to climb on is this just how they are or should they be sleeping through the night?
lead bed is the hink pink for heavy sleeper
at least 8 hours of sleep
Lizards needs 11hrs of sleep
A newborn may sleep as much as 16 hours a day (or even more), often in stretches of 3 to 4 hours at a time. And like the sleep all of us experience, babies have different phases of sleep: drowsiness, REM (rapid eye movement) sleep, light sleep, deep sleep, and very deep sleep. As babies grow, their periods of wakefulness increase. At first, though, the need to feed will outweigh the need to sleep. Many pediatricians recommend that a parent not let a newborn sleep too long without feeding. In practical terms, that means offering a feeding to your baby every 3 to 4 hours or so, and possibly more often for smaller or premature babies. Breastfed infants may get hungry more frequently than bottle-fed babies and need to nurse every 2 hours in the first few weeks.
an adult need sleep of maximum 8 hours.
People awakened during deep sleep do not adjust immediately and often feel groggy. Eventually, your body will demand that the debt be repaid. We don't seem to adapt to getting less sleep than we need; while we may get used to it. Many studies make it clear that sleep deprivation is dangerous.