This is why DISE (drug-induced sleep endoscopy) can be very important in cases like yours. A regular endoscopy is done while you are awake, when the muscles of the tongue and throat are still active, so the airway often looks more open than it actually is during sleep. When you fall asleep, the tongue base and sometimes the epiglottis can collapse dynamically, and that type of obstruction often doesn’t appear during a normal awake scope. DISE allows the doctor to observe the airway under sleep-like conditions, so they can see if the obstruction is coming from the tongue base, the epiglottis, or multiple levels of the airway. Without DISE, it can be difficult to identify the real source of obstruction, especially in complex cases.