ABSTRACT
The Discovery of the VLPO as a Potent Sleep Center of the Brain......................43 Serotonin Modulation Reveals Two Types of Presumed Sleep
Promoting Neurons in the VLPO .........................................................................47 Hypnogenic Substances Differentially Modulate Type-1 and
Type-2 Neurons: An Emphasis on the PGD2-Adenosine Axis............................53 A Functional Model of the Neuronal Network Responsible
for Sleep Promotion ..............................................................................................55 Summary ..................................................................................................................56 Acknowledgments....................................................................................................56 References................................................................................................................57
