Why Your AHI Went Up This Week and What to Check First

Your AHI jumped. You opened CPAP Clarity or myAir, saw a number higher than your usual, and now you're wondering if something is wrong.

Most of the time, a single bad night is just a single bad night. Bodies, sleep, and air are all variable. What matters is the pattern across a week or more, not any one night in isolation.

Here is the order I would check things in.

Step 1: Is this actually a trend, or one rough night?

Open CPAP Clarity (free, runs entirely in your browser) and go to the history page. Look at the last 14 nights. A single spike against an otherwise flat line is normal and usually does not need action. A pattern where your AHI has been climbing for several nights in a row is what we want to investigate.

If it is one rough night, note what was different about that day (new pillow, cold, drinks, travel, stress) and watch the next two or three nights before doing anything.

If the line is trending up, keep going.

Step 2: Check your leak first

A mask leak is the single most common cause of a rising AHI. When your mask leaks, the machine cannot deliver the pressure it thinks it is delivering, and obstructive events slip through.

On CPAP Clarity, look at your leak trend. If your leak is above 24 L/min on recent nights, or if it is trending up week over week, the mask is the first place to look. Full guide to fixing CPAP leaks.

Quick fixes to try tonight:

• Make sure the mask is not over-tightened. Tighter is not always better. Most mask leaks actually get worse past a certain tension.
• Check the cushion for wear. Silicone cushions get shiny and hard with time. If yours has a visible worn ring, replace it.
• Try a different sleep position. Side sleepers often have leaks on the side their mask is pressed into.
• If you are a mouth breather, a chin strap or a full-face mask can stop the leak at the source.

Step 3: Check your pressure versus your prescribed max

If your leak is fine but your AHI still rose, look at your pressure P95 (the pressure your machine hit for 5% of the night). If P95 is near the top of your prescribed range (or bumping against it), your machine wants more pressure than it is allowed to give.

On CPAP Clarity, the dashboard shows your pressure P95 next to your average. A rule of thumb: if P95 is within 0.5 cmH2O of your prescription maximum on three or more nights in a row, it is worth asking your provider to raise the max. More on how CPAP pressure settings work.

Step 4: Check your mask age and cushion schedule

Even without a visible leak spike, an aging mask loses seal quality gradually. Cushions are typically replaced every one to four weeks depending on the material, and the mask frame every three to six months.

If you have been using the same cushion for longer than that, replace it before you change anything else. This is the cheapest fix and often the one that works.

Step 5: Did your centrals jump?

Sometimes the number going up is not obstructive events but centrals (brain-driven pauses, not airway-related). CPAP Clarity will flag this as "high central apnea rate" or "mostly central events" on the dashboard.

If centrals are up and obstructives are flat, the cause is different; mask changes will not help. This pattern is common in the first 12 weeks of therapy and usually resolves on its own. What treatment-emergent central apnea is and when it matters.

Step 6: Lifestyle changes in the last 1 to 2 weeks

AHI is sensitive to several things that have nothing to do with your machine:

• Alcohol. Even a couple of drinks the same night can push your AHI up. Effects fade within 24 hours in most people.
• New medication. Opioids, benzodiazepines, and some sleep aids can suppress breathing drive and push AHI (especially central AHI) up.
• Illness. A cold, sinus congestion, or any respiratory infection can bump AHI. Give it two weeks past recovery before worrying.
• Weight change. A gain of even a few pounds can change your effective pressure requirement, especially if you were already at the top of your range.
• Position. Sleeping more on your back than usual typically raises AHI.

If any of these describe your week, they are the likely cause. You do not need to change settings; you need to let the variable settle.

Step 7: When to call your sleep doctor

Book an appointment if any of these are true after you have worked through the steps above:

• Your AHI has been above 5 events per hour for more than two weeks despite troubleshooting.
• Your central apnea rate (not total) is above 5 events per hour for more than three months.
• Your pressure P95 is at your prescribed maximum on most nights and a cushion change did not bring it down.
• You are waking up tired or with headaches despite the data looking normal.
• Anything has changed clinically (new heart condition, new medication, new sleep problem).

Bring your data. How to generate a PDF for your doctor walks through the one-click report from the dashboard. A physician scanning the cover page can see AHI, compliance, dominant event type, and leak quality in under 30 seconds, which makes the conversation much more productive than walking in with a vague "I feel off."

---

This is informational, not medical advice. If you are genuinely worried about your therapy or feeling worse than usual, contact your sleep physician directly. CPAP Clarity surfaces patterns in the data your machine recorded; it does not diagnose or treat.