Insomnia (1998)

Detectives Jonas and Erik are called to the midnight sun country of northern Norway to investigate a recent homicide but their plan to arrest the killer goes awry and Jonas mistakenly shoots Erik The suspect escapes and a frightened Jonas pins Eriks death on the fugitive Jonas continues to pursue the killer as he seeks to protect himself however his mounting guilt and the omnipresent sun plague him with an insomnia that affects his sanity