This book focuses on the sleep-related disorders in Parkinson s disease (PD), demonstrating that they are among the most common non-motor manifestations of PD and have a significant negative impact on quality of life. Sleep changes may also serve as markers to identify patients in the preclinical stage of PD.  This book presents recent major breakthroughs related to sleep disorders in PD, such as REM sleep behavior disorder (RBD), insomnia, nocturia, restless legs syndrome and periodic limb movements, sleep disordered breathing, excessive daytime sleepiness, and circadian rhythm disorders. It also discusses the epidemiology, etiology, diagnosis, clinical implications, associated features, evaluation and management of these disorders and suggests some further research directions in these areas in order to develop neuroprotective therapies for PD.