In medical terms, Delirium is a mental state of confusion, disorientation, anxiety and hallucinations that is caused by dehydration, drug intoxication, or infection.
This is a negative perspective as viewed by a rational, scientific and non-spiritual mind.
To my knowledge and experience, I have never encountered anyone being deliriously unhappy, deliriously depressed or deliriously afraid.
Apparently, being deliriously happy is not yet a medical condition, presumably because it is an emotional state of being.
Positive emotional states of being are not a medical condition. The symptoms that are diagnosed as medical conditions are required to be either physical or mental and negative.
Being Deliriously Happy is a Spiritual Attainment.
Spiritual Delirium is a state of being in ecstasy that is spontaneous and exciting.
Delirium is uncontrolled excitement because when I seek to control my excitement, my ecstasy disappears.
When uncontrollable emotional states of being become a problem, doctors will seek to control them with drugs.
However, creating an emotional state of delirium with drugs has been deemed as unlawful in our society.
Happiness is my natural state of being. Delirium is just a measure of how well connected to that happiness I can be.
Being Deliriously Happy in this dual reality world, without the use of drugs, is no mean attainment.