“…Eventually, arterial CO 2 increases and results in morning headaches, fatigue, sleep disturbances, and hypersomnolence. 4 For wheelchair users, symptoms may be minimal except during intercurrent respiratory infections, when they complain of anxiety, inability to fall asleep, and dyspnea. Patients are observed for tachypnea, paradoxical breathing, hypophonia, nasal flaring, use of accessory respiratory musculature, cyanosis, flushing or pallor, and airway secretion congestion.…”