A night terror, also known as sleep terror or pavor nocturnus, is a parasomnia sleep disorder characterized by extreme terror and a temporary inability to regain full consciousness. (sciencedaily.com)
It can also happen during sleep terrors and sleepwalking, but on its own is not a threatening condition. (mattresshelp.org)
Sleepwalking can also be in conjunction with sleep terrors and sleep talking. (mattresshelp.org)