You don't have to look far to find language from the Land of Nod. The biblical book of Genesis is the source of the phrase Land of Nod, but we can thank our Greek ancestors for the modern adjectives hypnagogic and hypnopompic. Hypnagogic means "of, relating to, or associated with the drowsiness preceding sleep," while hypnopompic is used for the other end of the sleep cycle, where it means "of, related to, or associated with the semiconsciousness preceding waking; dispelling sleep."

Don't blink or you may miss our two final sleep terms: acroparesthesia and pandiculation. Acroparesthesia is the formal term for "the condition of burning, tingling, or pricking sensations or numbness that may be present in the extremities upon awakening; it is attributable either to the compression of nerves during sleep, or to an unknown cause." Pandiculation refers to "the stretching and stiffening, especially of the trunk and extremities, as when fatigued or drowsy or after waking from sleep."