Anxiety and depression are examples of possible daytime dysfunctions that are also diagnosable disorders on their own right. Only a sleep specialist can determine whether a patient’s daytime dysfunctions are connected to insomnia or not. There are many possible daytime dysfunctions, including social/vocational/educational dysfunctions, mood disturbances, lack of energy or motivation, hyperactivity, aggression, an increase in errors at school or work, and worrying about sleep.