They occur during REM sleep, usually in the second half of the night
Unlike nightmares, sleep terrors typically occur in stage 3 or stage 4 NREM sleep during the first third of the night.
Nightmares are more common during what is called REM sleep.
They occur during REM sleep, usually in the second half of the night
stage 4
Bedwetting occurs at stage 3 of NREM sleep (Stage 4)
The rhythmic bursts of brain activity that occur during Stage 2 sleep are called sleep spindles. These are short bursts of brain waves that help in the consolidation of memories and are characteristic of this stage of sleep.
Nightmares That Surface from Shallow Sleep was created in 2002.
sleep spindles
It happens in the 4th stage
There are 4 stages of sleep: Stage 1, Stage 2, Slow wave sleep, and REM. The stages occur in that order. Stage 1 occurs as you are falling asleep, and REM occurs last and contains the craziest dreams. REM is the most difficult to awaken from, so it is likely the stage that you have heard referred to as 'deep sleep'.
A nightmare is one of those dreams where, when you wake up, you thing "Oh, thank goodness. It was only a dream." Then you roll over and go back to sleep. Night terrors are dreams so vivid that you wake up thinking that the incident actually occurred, and may continue to think so until you are fully awake. Most people have them once or twice a year. If you are having night terrors regularly, you need to consult a professional and get some counseling. Frequent sleep disruptions are extremely bad for your physical and emotional health. Whatever you do, don't drink or take sleeping medications to avoid them. They do nothing to correct the underlying problem, and you will become dependent on the booze or meds to help you sleep, just adding another layer of problems.
Sleep spindles occur during stages 2 of sleep, they are brief bursts of frequency in our brain wave patterns
See the Wikipedia link on Stages of Sleep, below. Some researches have found evidence that disturbing dreams, nightmares and sleep walking tend to occur during Non-Rapid Eye Movement Sleep. But other studies draw different conclusions, which is normal in a relatively young area of research such as sleep studies. Additionally, one must expect wide variation between individuals.
they dream of things or have nightmares or they don't have dream or a nightmare they just sleep