Children are often given to sleep terrors and sudden inconsolable screaming and parents to sleepless nights. A new Canadian study of twins suggests that such nightly horrors could be genetic.
"Our results show that there is a substantial effect of genetics factors in sleep terrors," ABC Online quoted Dr Bich Hong Nguyen, of the Sleep Disorders Centre at Montreal's Sacre-Coeur Hospital, as saying.
The researcher, however, admitted that specific genes behind the phenomenon had not been identified as yet.
Describing their work in the journal Pediatrics, the researchers revealed that they studied 390 sets of twins, and found that identical twins were much more likely to both experience night terrors than fraternal twins.
I may be significant to note here that identical twins have nearly identical genetic makeups, while fraternal twins do not.
The team did not deny that environmental factors could be partially responsible for night terrors because the children were being raised in similar settings.
In all, the team observed that 37 per cent of the twin sets had sleep terrors at 18 months, and that the problem disappeared a year later for about half of them.
The researchers even referred to studies that have previously suggested that sleepwalking, sleep talking, and night terrors may be inherited.
"(In contrast to nightmares) the onset of sleep terrors is abrupt and frightening, usually sudden arousal with screaming. During these events children seem confused and disoriented. Any attempt to awaken them may increase their agitation and prolong their episode," the study says.