**Notes**

I became interested in the somnambulism phenomenon while serving as a Visiting Professor at Kyoto University, Primate Research Institute, Inuyama (Japan) and studying the activity-sleep behavior of New World and Old World Monkeys, between 2002 and 2006. I appreciate the discussions I have had with veterinarians, Dr. Kiyoaki Matsubayashi and Dr. Juri Suzuki, during that period.
