The effect of rapid palatal expansion upon our patient’s symptoms. This figure demonstrates our patient’s self-report assessments of somatic arousal (Mood and Anxiety Symptom Questionnaire anxious arousal subscale; MASQ Anxious Arousal), fatigue (Fatigue Severity Scale) and sleepiness (Epworth Sleepiness Scale) over time beginning at time 0, the first day of the month in which our patient presented to our sleep disorders center for consultation. The seven-week period during which rapid palatal expansion was performed is represented by vertical lines. Arrows also mark the dates of our patient’s two polysomnograms (PSG 1 and PSG 2). Somatic arousal and sleepiness decreased to normal levels during the follow-up period while fatigue decreased to the borderline between normal and mild (minimal).