My first contact with the other Jerome Siegel came in 1973, when I moved to Los Angeles to do postdoctoral work at UCLA. My thesis work had been listed in a nationally available posting without any address. The Brain Inf- mation Service, thinking they knew where I was, listed the other Jerome Siegels Delaware address for reprint requests. I soon received a letter from Jerry along with the requests he had received and we have remained in c- tact ever since. I am occasionally reminded of my namesake when I meet a new colleague who is impressed that someone so young published a paper in Science in 1965 (one year out of high school, if it had been me). I entered the field in the early 1970s just as he left. My interests in REM sleep and brainstem mechanisms have been eerily similar to his (and he also did po- doctoral work at UCLA), so our research contributions can be distinguished easily only by my use of my middle initial (which has occasionally been om- ted from my publications). So, my namesake and I both have an interest in seeing to it that no one brings shame to the name. The current work certainly fulfills that dictum. This is a very unusual book, both in its scope and in its approach to the - terial.