Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Delirium ?
    ### Response:
    Delirium is a condition that features rapidly changing mental states. It causes confusion and changes in behavior. Besides falling in and out of consciousness, there may be problems with       - Attention and awareness    - Thinking and memory    - Emotion    - Muscle control    - Sleeping and waking       Causes of delirium include medications, poisoning, serious illnesses or infections, and severe pain.
    