Study for Pregnant Women With Insomnia Using Sleep Inducing Digital Sound Application

Inclusion Criteria: * 19 years older * pregnant women in their 1st and 2nd trimester * suffering from insomnia symptom * scored 10 or high in screening ISI * a person who voluntarily agreed to participate in this RCT Exclusion Criteria: * Has a confirmed diagnosis of insomnia disorder other than chronic insomnia based on DSM-5(ex. Narcolepsy, Periodic Limb Movement, Restless Leg syndrome, etc) * Has a confirmed diagnosis of other neuropsychiatric disease * Has an history of suicidal ideat or attempt * Shift worker * Going through other interventions regarding insomnia(sleeping pills, light therapy, other alternative interventions) * Has a severe auditory, visual, or cognitive impairment * A person who cannot familiarize with the usage of smartphones and digital applications * Has a history of alcohol or other substance use disorder * A person with high risk pregnancy considered inadequate to participate in this trial by obstetric experts * A person considered inadequate to participate in this trial by a clinical expert