Among the up-regulated glycopeptides, ENLTAPGSDSAVFFEQGTTR + 5-4-1-1 and 6-3-0-2 derived from CP glycoprotein and glycopeptide LPTQNITFQTESSVAEQEAEFQSPK + 6-3-0-2 derived from ITIH4 glycoprotein, which increased in the NT1 samples, were observed as prominent alternations in expression the were associated with a change in the narcolepsy patient. Here, ITIH4 is linked to narcolepsy.