"The lunatic is in my head"

This quote from the tune "The Lunatic remains in My Head" by Pink Floyd is a metaphor for the inner chaos and chaos that can exist in one's mind. It speaks to the concept that in some cases our own thoughts can be our own worst enemy, which we can be our own worst critic. The expression "the lunatic is in my head" suggests that the speaker is struggling with their own mental health, which they are struggling to understand their own thoughts and sensations. It is a pointer that we all have our own inner battles to fight, and that it is important to be kind to ourselves and to take care of our mental health. The song is a suggestion that it is all right to not be okay, and that it is important to connect for aid when needed.