09/06/2026
She would wake up at almost exactly the same time every night, around three, with her heart hammering and no idea why. No nightmare she could remember, nothing wrong in the room. Just a jolt of adrenaline and then an hour of lying there, wide awake, unable to settle back down.
For a long time she was certain it was anxiety, and that made complete sense, because that is exactly what it feels like. And sometimes that is what it is. Anxiety is real, and it deserves to be taken seriously. But it is not always the whole story, and there is another explanation that often gets missed.
When breathing is interrupted during sleep, oxygen levels dip, and the body responds by releasing a surge of stress hormones to jolt you awake and get the breathing going again. You do not feel the pause, because you are asleep for it. What you feel is the aftermath, the pounding heart, the sudden alertness, the adrenaline. The racing heart is the alarm going off, not the original problem. There is even a reason it tends to hit in the early hours, since sleep gets deeper later in the night, which relaxes the airway more, so the interruptions can cluster then.
None of this means anxiety is not real, and it is not a reason to change any care you are getting. It simply means that if you are waking at 3am with a pounding heart night after night, your breathing overnight is worth ruling out too. It is testable from your own bed, over multiple nights, with results reviewed by a sleep physician. No clinic stay. No referral needed to start the process. Typically covered by insurance.
DM us TIRED for the home sleep test details and find out what is really going on.
sleepdisorder.center
Serving patients across Ventura County, Santa Barbara, Los Angeles, Kern, and San Luis Obispo County.
Do you wake around the same time every night with your heart racing?