Diurnal Variation of Mood
A pattern of feeling worse during a particular part of the day. Depressed patients often exhibit this symptom, and typically report feeling more depressed in the morning.
Example: The patient is profoundly agitated in the morning and relatively calm in the evening every day for several weeks.
Grinnell, R. (2008). Diurnal Variation of Mood. Psych Central. Retrieved on May 23, 2015, from http://psychcentral.com/encyclopedia/2008/diurnal-variation-of-mood/