The article discusses the unknown aspects of how cerebral or spinal fluid functions in the brain, suggesting that fluid dynamics may play a critical role in various neurological conditions. The comments from users touch on personal experiences with cough headaches and their potential link to fluid mechanics within the brain, hinting at broader implications for studying how fluid circulation is affected by sleep and posture. These insights advocate for further research into the relationship between brain fluid dynamics and specific headache syndromes, which could lead to better understanding and treatment of such conditions.