Final answer:
Age is the biggest known risk factor for Lewy Body Dementia (LBD), and REM sleep behavior disorder is closely associated with neurodegenerative diseases and is treated with appropriate medication and environmental adjustments.
Step-by-step explanation:
In the context of Lewy Body Dementia (LBD), the biggest known risk factor is age. Lewy Body Dementia is associated with neurodegenerative diseases like Parkinson's disease, and age is a significant risk factor for both of these conditions. The presence of REM sleep behavior disorder (RBD) also serves as a potential diagnostic and predictive marker for neurodegenerative diseases, and it is treated with medications such as clonazepam and melatonin, alongside modifications to the sleeping environment to ensure safety.