Conversation: The conversation between human and AI assistant.
[|Human|] What is this sound coming from the back of my head. It is a crackly, squirting sound that Inam aware of when I am lying down in bed. It feels like my brain is shutting down for a fraction of a second as I hear the noise. I am not aware of it during the day.
[|AI|]  Hi, Cracking sounds in the joints of the neck are thought to be simply movements of cartilage, tendon, and bones which normally occur when the skeleton is moved about by the muscles which over and attach to the bones.  There is no abnormality that is worried about on the basis of such sounds unless there is the pain, weakness in a limb, or loss of sensation when a joint is flexed, extended, or rotated.  Some cracking sounds are thought to be also due to the release of nitrogen gas from the cartilage and joint spaces themselves. Hope I have answered your query. Let me know if I can assist you further.