Amnesia has long been the fodder of pop culture, conveniently allowing outlandish story lines to loop and twist to cover flaws in cast or plots. "50 First Dates," anyone?
"Before I Go to Sleep," opening Friday, is based on the popular novel by S.J. Watson. Nicole Kidman stars as a woman who suffers anterograde amnesia after a traumatic accident. Subsequently, each night after she falls sleep, her memory erases.