Final answer:
Periods of excessive euphoria and uncontrollable hyperactivity alternating with other periods are indicative of Bipolar Disorder, a mood disorder characterized by episodes of mania/hypomania and depression.
Step-by-step explanation:
The symptoms described in the question, such as periods of excessive euphoria and uncontrollable hyperactivity alternating with periods (presumably of depression or normal mood), are characteristic of Bipolar Disorder. Bipolar Disorder is a mood disorder that includes episodes of mood elevation (mania or hypomania) and depression. During manic episodes, individuals may experience heightened energy, euphoria, and a decreased need for sleep, often with grandiose ideas and potential impairment in daily functioning. These periods differ from the hyperactivity seen in attention deficit hyperactivity disorder (ADHD), which is a neurodevelopmental disorder primarily affecting attention and impulse control on a persistent basis rather than episodic mood changes.