Having bizarre experiences upon awakening, such as sensing an alien being is in one's bedroom, is characteristic of the condition known as REM behavior disorder.

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These experiences are more characteristic of sleep paralysis, a condition where individuals are conscious but unable to move or speak as they are waking up or falling asleep, often accompanied by vivid hallucinations or sensations of a presence in the room, not REM behavior disorder, which involves physically acting out dreams.

Having Bizarre Experiences Upon Awakening, Such as Sensing an Alien