Anecdotal proof of alien sightings or abductions, which Hopkins considered "tightly imagined testimonies" by abductees, included victims' stories of observing unconventional objects in the sky, witnessing unusual activity (such as aliens digging for soil samples), flying through the air or being transported to a ship, a sense of being watched or the presence of hooded beings near the bed at night, a sense of paralysis or immobilization while lying in bed or in their cars, impressions of flying or passing through closed windows or walls, a feeling of having been outside upon awakening, invisibility (both alien and human) and, most especially, a sense of missing or lost time.