Background Every disruption in the start, continue or decrease of quantity or quality of the sleep are considered as sleep disorders. The major cause of sleep disorders in children are temporary and spontaneously improve.

Methods In a cross-sectional study, children who presented to the Najmiyeh hospital in Tehran during 2009 and 2010 were enrolled. Children 3 months to 14 years with any chronic disorders who were referred for routine screening and vaccination in this age range were included and the data was collected by using a questionnaire included demographic and clinical. The data were analyzed using SPSS software version 17th by statistical frequency, chi-square, Student t test and Mantle Hanzel tests and P.value < 0.05 was considered significant.

Results The 301 children were studied. Mean age was 26.60±31.59 months with a standard deviation. The study population sex ratio, male to female equal to 53.3% and 46.4% is equivalent to 161 to 140. 55.48% of the parents brought the child with complaints of sleep. The underling variables including sex, age, affect the prevalence of parent report sleep disorders (P.value < 0.05).

Conclusion We suggest that further programmed evaluations are needed to evaluate children according to their age and the children should be assessed for sleep disorders in any range of the ages.