Effects of an Indigo Blanket on Insomnia Symptoms: Double Blind, Placebo-Controlled, Randomized Pilot Study

Thirty subjects were recruited in this study and were randomly divided into two groups, indigo blanket and placebo asked to complete the sleep questionnaires [Insomnia Severity Index, Pittsburgh Sleep Quality Index, World Health Organization (WHO)-5 Well-Being Index] and to record the sleep diary before and after they use the blanket. The effects of each blanket was evaluated by sleep quality improvement and sleep satisfaction during their use of blanket, based on the sleep diary and sleep questionnaires.