Do you believe that these conditions are real?

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These are just some conditions that some people don't consider as real medical conditions. I would like to know different perspectives about these, and would like to understand both sides. How Do you feel about the following conditions? Delayed Sleep Phase Syndrome (also known as Delayed Sleep Phase Disorder) a disorder where your internal clock is off and you sleep "unusual" times, such as most people sleep 10pm to 6am or somewhere around those typical hours where as someone with this disorder would sleep from 3am to 11am every night, or noon to 8pm, etc. ADHD Attention-Deficit Hyperactivity Disorder a disorder where a person (particularly a child) can not pay attention for long periods of time and are unusually hyper. Bipolar disorder or manic depressive this is a mood disorder where a person experiences highs (manic) episodes, some can be to the extreme causing hallucinations and delusions. These moods alternate with depressive moods, these can include suicidal thoughts. Between Highs & lows people with BPD can experience periods of normal moods, they can cycle rapidly, or the can experience mixed episodes where both highs and low are present at the same time. Oppositional Defiant Disorder an ongoing pattern of disobedient, hostile, and defiant behavior toward authority figures, children with this disorder go beyond typical childhood behaviors