Yes, even if you don’t recall waking up, sleep apnea can still be severely disrupting your sleep. When your brain senses a lack of oxygen due to obstructed breathing, it briefly awakens you so you can reopen your airway. These interruptions are often so short that you don’t remember them the next day. However, they can happen 30 or more times a night, leaving you feeling groggy, fatigued, and unrested the following morning despite a full night’s sleep.