Otherwise, the child will have a hard time going to sleep alone. Nightmares are relatively common during childhood. The child remembers nightmares, which usually involve major threats to the child's well-being. Nightmares, which begin at a variety of ages, affect girls more often than boys. For some children nightmares are serious, frequent, and interfere with restful sleep.
Sleep terrors are different from nightmares.
The child with sleep terrors will scream uncontrollably and appear to be awake, but is confused and can't communicate. Sleep terrors usually begin between ages 4 and 12. Children who sleepwalk may appear to be awake as they move around, but are actually asleep and in danger of hurting themselves. Sleepwalking usually begins between ages 6 and 12. Both sleep terrors and sleepwalking run in families and affect boys more often than girls.