GABAA receptor mediated hypersomnia can be treated by administering a GABAA receptor antagonist (e.g., flumazenil; clarithromycin; picrotoxin; bicuculline; cicutoxin; and oenanthotoxin). In some embodiments, the GABAA receptor antagonist is flumazenil or clarithromycin. The GABAA receptor mediated hypersomnia includes shift work sleep disorder, obstructive sleep apnea/hypopnea syndrome, narcolepsy, excessive sleepiness, hypersomnia (e.g., idiopathic hypersomnia; recurrent hypersonmia; endozepine related recurrent stupor; and amphetamine resistant hypersonmia), and excessive sleepiness associated with shift work sleep disorder, obstructive sleep apnea/hypopnea syndrome, and hypersomnia (e.g., idiopathic hypersomnia; recurrent hypersomnia; endozepine related recurrent stupor; and amphetamine resistant hypersomnia.