Why You May Not Feel Better After Using CPAP for Sleep Apnea

Medically reviewed by Sanja Jelic, MD

Continuous positive airway pressure (CPAP) therapy can be effective in treating sleep apnea, but some people may not feel better when first starting treatment. There are many reasons for this, some of which are transient and will ease over time. Others may require an adjustment of treatment to help you feel better.

CPAP, a machine that uses mild air pressure to keep your airways open while you sleep, is sometimes known to cause insomnia, discomfort, and even weight gain (referred to as "CPAP belly"). Fortunately, most of these will resolve as treatment is fine-tuned and your body adapts to therapy.

This article explains why you may not feel better after starting CPAP therapy and ways to help better cope as you adjust to treatment.

Your Sleep Apnea Is Mild

Excessive daytime sleepiness is a common symptom of untreated sleep apnea. However, not everyone has this symptom and many wonder why they should go through the hassle of CPAP if they don't feel any difference.

This is especially true for people with mild sleep apnea (defined as having between five and 14 breathing interruptions per night). At this level, many people have little, if any, daytime sleepiness and score low on the Epworth sleepiness scale—meaning they don't need treatment for daytime sleepiness.

But that doesn't mean that they don't need treatment for sleep apnea.

If left untreated, mild sleep apnea is likely to progress over time and become worse. This, in turn, can increase your risk of long-term complications, such as diabetes, heart disease, or stroke.

Even over the short term, CPAP can benefit people with mild sleep apnea, in part because they may not realize how much the condition affects them and consider their current state as being "normal." It is only after treatment that they may realize that their "normal" was not normal.

According to a 2020 study in Lancet Respiratory Medicine, people treated with CPAP had better vitality scores—a subjective measurement of one's health, wellness, and energy—than those who were not. At the end of the three-month trial period, those treated with CPAP had a vitality score of 7.5 out of a possible 10 compared to 1.5 for those who were not treated.

You Are Not Using It Long Enough Each Night

It can be hard to adjust to CPAP therapy. You may want to remove your mask, especially as it gets closer to the morning. The problem with this is that sleep apnea often gets worse as morning approaches.

Rapid eye movement (REM) sleep mostly occurs in the last third of the nightly sleep cycle. During this stage, the soft tissues in your throat, such as the tongue and soft palate, will temporarily relax. When this happens, your airways will narrow or collapse, cutting your breathing off momentarily.

In order to reap the benefits of CPAP, you need to commit to wearing the mask from bedtime right up until the time when you awaken in the morning.

CPAP Is Keeping You Awake

Using a CPAP machine is not without its challenges. Some people may struggle with the fit of the CPAP mask which, if not properly sized, can leak or cause marks, pain, sores, or ulcers on the face. Others may find breathing against the air pressure difficult.

To better overcome this, work with your healthcare provider to find the mask best suited for your face. You can try other options, including nasal pillows, nasal masks, and full-face masks.

You can also inquire about CPAP machines with a "ramp" feature that allows you to start at low air pressure and gradually increase as you fall asleep.

You Have Insomnia for Other Reasons

Insomnia, a condition in which you have trouble falling or staying asleep, is a common symptom of sleep apnea.

If you have insomnia prior to undergoing CPAP therapy, the very notion of putting on a mask for a machine that blows air in your face may not sound like a remedy that would help.

However, it is important to remember that the main reason for insomnia in people with sleep apnea is that the stoppage of breathing often awakens them, sometimes multiple times a night. With perseverance, CPAP can help reduce this and allow you to get a full night's rest.

If your insomnia seems to be getting worse with CPAP, ask your healthcare provider about sleep aids or ways to improve your sleep hygiene. There are also therapists trained in cognitive behavioral therapy for insomnia (CBTI) who can help.

Your CPAP Pressure Needs Adjusting

You may not get the full benefit of treatment if your CPAP settings are incorrect. These settings regulate the pressure of air delivered to your mask.

If the setting is too high, you may struggle to exhale and find yourself waking in the middle of the night. If the setting is too low, you might continue to have frequent breathing gaps and wake up in the morning feeling tired.

Finding the right setting can take trial and error. One way to get there faster is to check the nightly apnea-hypopnea index (AHI) report on your machine. The AHI report will tell you how many breathing interruptions you had per night.

Ideally, you would aim for less than five per hour. If it is more than this, the CPAP setting may need to be increased. If you find yourself struggling against the air pressure, the setting may need to be decreased.

Do this with your healthcare provider, however, who will want to adjust the setting based on other factors, such as changes in your blood oxygen.

You're Gaining Weight

In the past, CPAP was thought to lead to weight loss. Recent studies suggest that may not be the case and that people often gain weight, particularly around this midsection. Many people call this "CPAP belly."

There are some theories as to why this occurs. It is thought by some that when you have sleep apnea, your body burns up a lot of energy as you struggle to breathe. When your breathing improves with CPAP, you burn fewer resting calories and can start to gain weight.

In such cases, an improved diet and routine exercise can mitigate the risk. Exercise is especially beneficial for people with sleep apnea, increasing the tone of the upper airways and reducing the accumulation of fluid in the neck that can contribute to airway collapse.

At the same time, CPAP can cause you to swallow air if the setting is too high, leading to bloating and abdominal distention. Adjusting the machine to a lower setting may prevent this and reduce the appearance of a bulging belly.

You Start Having Sleep Apnea Symptoms

In some people, CPAP therapy can lead to a condition known as complex sleep apnea (CSA). This occurs when the brain "forgets" to tell the respiratory muscles to make you breathe. CSA is a type of central sleep apnea in which the brain is the cause of the breathing gaps as opposed to obstructive sleep apnea in which the airways physically collapse.

The exact cause of CSA is unknown. With that said, central apnea is more common in people who live in high altitudes. It is possible, therefore, that a high air pressure setting on your CPAP machine may contribute to CSA symptoms. In such cases, lowering the CPAP settings can help.

Fortunately, CSA resolves in 98% of people with continued treatment, although this can take several months.

You Just Started Treatment

The amount of time it takes for CPAP therapy to work differs from one person to the next. If sleep apnea is severe prior to treatment, the improvement may be more obvious. On the other hand, when the symptoms are mild, it may take longer to notice any changes.

Keep in mind that it can take several weeks before you feel the impact of CPAP therapy. Perseverance, support, and regular contact with your healthcare provider will help you cope with the transition. In time, you may not only feel the benefits of CPAP but see the benefits on your AHI report and with improved blood pressure readings.

If you are not noticing any improvement, speak with your sleep specialist about ways to adjust your therapy to work better for you.

Summary

If you are using CPAP therapy but still feel tired, there could be several reasons why. It's possible that you haven't been doing the therapy for long enough, you are removing your mask during the night, your pressure needs to be adjusted, or your symptoms are mild.

It may take several weeks of proper and continuous usage before you feel the results of CPAP therapy. If you haven't noticed any changes, be sure to speak with your doctor. There is a chance they may diagnose you with another underlying medical condition or complex sleep apnea. In these cases, other treatment methods may be used.

Frequently Asked Questions

What should I do if I cannot tolerate CPAP?

Speak with your doctor. They may determine that you need a different type or size mask, or that you have another condition that may require additional treatment.

What are alternatives to CPAP?

Other ways to manage sleep apnea may include:

• Weight loss

• An oral appliance or other type of device to help with breathing

• Experimenting with different sleep positions

• Medication

• Surgery

How much weight do I need to lose to cure my sleep apnea?

Research suggests that if you're moderately obese, shedding 10% of your weight may relieve your symptoms by up to 50%. Losing more weight may reverse sleep apnea altogether.

Read the original article on Verywell Health.