"Insomnia" is a maxi single by The Hiatus released on November 18, 2009. It peaked at number 5 on Oricon Singles Chart.
This single was produced by Takeshi Hosomi and Hirohisa Horie. All the lyrics were written by Hosomi but the music was composed by all of the members; Seigen Tokuzawa arranged the string section of "Insomnia". The record jacket was designed by Balcolony and Admir Jahic drew the cover art.