Secret History of UFOs Sleep Paralysis Scientists have a theory about why alien abductions usually occur at night. Info Next Airing: THU DEC 26 3AM ET Secret History of UFOs: Sleep Paralysis Scientists have a theory about why alien abductions usually occur at night. Share Share this URL: Or you can use the code below to embed the video. The code updates if you change the width/height. Minimum dimensions are 320x211 pixels. <iframe width="640" height="391" src="http://channel.nationalgeographic.com//videos/sleep-paralysis/embed/" frameborder="0" scrolling="no" allowfullscreen></iframe> Width: px Height: px 1 comments   Get Livefyre FAQ Sign in + Follow Post comment Link Newest | Oldest A R 5pts As Dr. David Jacobs points out, may abductees report they were fully awake and conscious when abducted, and so the sleep paralysis hypothesis just **doesn't work**.