Sleepwalker

Sarah, a young woman plagued by sleep disorders, seeks help from a sleep clinic but soon finds her entire life turned upside down. As she undergoes observation, her surroundings seem to change in subtle ways, and her perception of reality becomes increasingly distorted. Despite the help of Dr. White, Sarah's grip on reality slowly unravels as she struggles to reconcile her conflicting memories and identities. As the lines between her dreams and reality blur, Sarah must confront the dark truth about her past and her own culpability in the twisted events that unfold.

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Some movies that have similar genres and were produced around the same time as Sleepwalker include Not Safe for Work, The Intruder, The Voyeurs, A Most Wanted Man, Mili, The Boy Next Door.