1. Introduction.- 2. Cytokines in the Brain.- 3. Interleukin-1 Receptors in the Nervous System.- 4. Cytokine Involvement in Sleep Responses to Infection and Physiological Sleep.- 5. Cytokine Actions on Fever.- 6. Cytokine Effects on Neuroendocrine Axes: Influence of Nitric Oxide and Carbon Monoxide.- 7. Cytokine Actions on Behavior.- 8. The Role of Cytokines in Neurodegeneration.- 9. Cytokines as Therapeutic Agents in Neurological Disorders.- 10. Cytokines and Nociception.