Final answer:
Sleep paralysis is the phenomenon your roommate experienced, where one is temporarily unable to move or speak upon waking up. Sleep paralysis is often accompanied by vivid hallucinations and can be quite distressing.
Step-by-step explanation:
Sleep paralysis is the phenomenon your roommate experienced, where one is temporarily unable to move or speak upon waking up. It occurs when the transition between sleeping and waking is disrupted, leading to a temporary inability to move or speak. Sleep paralysis is often accompanied by vivid hallucinations and can be quite distressing.
This phenomenon is different from sleep apnea, which is characterized by pauses in breathing during sleep. Sleepwalking involves engaging in complex behaviors while asleep, and insomnia refers to a difficulty falling or staying asleep.