Which disorder includes having low energy, difficulty sleeping, missing assignments, and avoiding friends?

Bipolar disorder involves episodes of depression similar to those in depressive disorder, but it also includes manic or hypomanic episodes characterized by elevated mood, increased energy, and often impulsive behavior. The symptoms described in the question do not encompass the full spectrum of bipolar disorder, making it less applicable.

Schizophrenia is a severe mental disorder involving delusions, hallucinations, and disorganized thinking. While it may lead to social withdrawal and difficulties in functioning, it does not specifically manifest as low energy or difficulty sleeping in the same context as depressive disorder. The symptoms indicated in the question are not indicative of schizophrenia.

Anxiety disorders primarily involve excessive worry, fear, and physical symptoms of anxiety such as restlessness or difficulty concentrating. While they can lead to sleep issues, the low energy and social avoidance described are more characteristic of a depressive disorder rather than anxiety alone.