Troubled by bouts of sleepwalking and disturbing nightmares, graduate student Sarah Foster goes to

　　A medical student suffering from sleep paralysis finds herself plagued by a demonic entity, after

　　A sleep study goes awry when participants start to go missing.

　　The monster, which looks like a nastier version of "The Creature from the Black Lagoon,"

　　When 10-year old Olivia's Mom goes on a business trip for the weekend, she leaves Olivia home