Let's start with what we already know. If you have uncontrolled allergies, whether you are a child, adolescent or adult it will affect the quality of your sleep, and can be associated with daytime drowsiness, reduced alertness and learning optimally in the classroom as well. Just remember the last time you had a cold. Ask yourself; did I sleep well or not, when my nasal and sinus passages were congested? Chance is you awoke feeling tired the next morning. Same story for those who do not have controlled allergy symptoms, such as nasal congestion, that can be associated with poorer quality sleep and subsequent daytime drowsiness, etc.
It appears that having springtime allergies can have an impact on mood. We already know from some recent studies that having suboptimal control of allergy symptoms can be associated with a negative effect on your love life, probably secondary to feeling less amorous, due to allergy symptoms affecting your appearance, such as puffiness of eyelids, runny, drippy nose, etc, especially during the height of the allergy season.
A study published in the journal Psychosomatic Medicine found those seasonal pollen sufferers with sensitivity to ragweed pollen had experienced "significant fatigue and mood changes" in a number of patients studied.