Insomnia is defined as the chronic inability to fall asleep or to enjoy uninterrupted sleep. The majority of pregnant women complain of not getting enough sleep, and while this is generally considered normal, severe insomnia can adversely affect the pregnancy.

The main question that should be answered is "how severe is my insomnia?". The Insomnia Severity Index (ISI) is a self-report questionnaire consisting of 7 questions. The ISI assesses the nature, severity, and impact of insomnia for the “last month”.