A creepy sleep disorder called sleep paralysis has been getting some coverage in the news lately. Sleep paralysis is not being able to move your limbs right before falling asleep or immediately after waking up. A recent study published in Sleep Medicine Reviews has shed some light on this eerie sleep disorder. The study shows that sleep paralysis is most likely to occur in students and psychiatric patients. The common factor between these two seemingly different groups? This disorder is prevalent among people who have some sort of panic disorder. In the study, sleep paralysis was found to occur in 28% of students and 32% of psychiatric patients.