Nightmares are a type of undesirable sleep experience that occur while you are falling asleep, sleeping, or waking up. There are several characteristic features of experiencing a nightmare:  The storyline of the nightmare is often related to threats to your safety or survival. People experiencing nightmares will awake from their vivid dream with feelings of fear, stress, or anxiety.  When the dreamers of nightmares wake up, they will often remember the dream and be able to repeat the details. They will be able to think clearly upon awakening. Nightmares often keep the dreamer from falling back to sleep easily. Nightmares are most common in children ages 3-6, with up to 50% of children experiencing nightmares during these ages. However, nightmares are often experienced by adults as well, especially if the individual is experiencing a particularly high amount of anxiety or stress. Nightmares occur most often later in the sleep cycle during Rapid Eye Movement (REM) sleep. This is the period of time when dreaming is most prevalent, and it is when both good dreams and nightmares most commonly occur. While nightmares can occur for no reason at all, seeing or hearing something that frightens or alarms a person can result in a nightmare. The sights or sounds that cause a nightmare can be things that have really happened or things that are make-believe. Common causes of nightmares include illness, anxiety, the loss of a loved one, or a negative reaction to a medication. Nightmares usually leave the dreamer with intense feelings of fear, terror, and/or anxiety. It may be very difficult to return to sleep after a nightmare.  Expect to console your child after a nightmare. He or she may need to be calmed down and assured that there is nothing to be frightened of. Adults, teens, or older children experiencing nightmares may benefit from speaking with a counselor who can help identify what might be a source of stress, fear, or anxiety that is manifesting as nightmares.

TL;DR in Indonesian:
Pelajari ciri-ciri mimpi buruk. Mimpi buruk bisa terjadi kepada siapa saja tanpa memandang usia. Sadari kapan mimpi buruk terjadi. Pertimbangkan penyebab mimpi buruk. Bersiaplah untuk dampak bermimpi buruk.