Why do I make noises in my sleep? Snoring, humming and talking explained

Mumbling, occasional groaning and quiet snoring can happen during sleep without meaning you are getting poor rest. What matters more than the sound alone is whether it comes with breathing pauses, gasping, forceful movements or substantial daytime sleepiness. Those signs deserve investigation.

A recording can help describe what happens, but it cannot provide a diagnosis. Persistent snoring and noticeable breathing pauses deserve attention even when the person sleeping is unaware of them.

Common causes of sleep sounds

Relaxed, narrowed airways

Throat muscle tone changes during sleep. When air passes through a narrower space, soft tissues can vibrate and produce snoring. Sleeping on your back, a blocked nose, alcohol and certain anatomical features can contribute.

Volume does not reliably tell you whether sleep apnea is present. Quiet sounds without other symptoms are often unproblematic, but the absence of loud snoring does not rule out a breathing disorder.

Transitions between sleep states

Sounds, small movements or twitches can occur as you fall asleep or briefly become more alert. An isolated sleep-start twitch is usually harmless. Repeated unusual movement patterns or injuries should be described in more detail and assessed.

Breathing changes during REM sleep

Breathing rhythm and depth can become less regular during REM sleep. With an already narrow airway, sounds may come and go. You cannot reliably determine someone’s sleep stage at home from the sound alone.

Why some people hum in their sleep

A possible connection with catathrenia

Catathrenia means nighttime groaning or humming, often during a prolonged exhalation. Reported sound episodes can last around 2 to 50 seconds and occur in groups. A study of breathing patterns describes the phenomenon.

The mechanism is not fully understood; involvement of the larynx and glottis has been proposed. Catathrenia can occur in both REM and non-REM sleep. The simple rule “snoring on inhalation, catathrenia on exhalation” is only partly useful, because snoring can also occur during different breathing phases.

Other explanations for tonal sounds

A blocked nose, tonal snoring or wordless sleep talking can sound similar. Teeth grinding tends to produce scraping or grinding sounds and is not the typical explanation for prolonged humming. Noticing whether a sound accompanies breathing in or out can help when discussing it with a clinician.

A closer look at catathrenia

What people notice

A deeper breath is often followed by a slower, audible exhalation. Some people learn about it only from someone else. Others also report poor sleep or tiredness. The burden therefore varies from person to person.

Its position in sleep-disorder classifications has changed over time; it is now considered alongside sleep-related breathing phenomena. It is not simply another name for sleep talking or sleepwalking.

Is catathrenia dangerous?

A review that also included survey data generally did not describe the characteristic severe oxygen drops of a dangerous breathing disorder from catathrenia alone. The evidence is limited, however, and other sleep disorders can coexist. When the distinction is unclear, testing with sound, video and breathing measurements can help.

Distress matters even without dangerous breathing changes. Disrupted sleep for a partner, embarrassment or difficulties while traveling are understandable reasons to seek help.

Sleep talking and other vocalizations

Somniloquy

Sleep talking ranges from unintelligible mumbling to clear sentences. A population study of parasomnias shows that such experiences are common. Figures around 66 percent for ever having talked in sleep refer to particular surveys; they do not mean two-thirds of people speak regularly every night.

Stress, sleep loss and alcohol can increase the frequency for some people. The content is not a reliable clue to secret thoughts or conscious intentions.

Calling out and moving during REM sleep

An occasional vocalization is different from repeated punching, kicking or acting out dreams. The latter can fit REM sleep behavior disorder. A study of REM behavioral events in early Parkinson disease involved a specific patient group; ordinary sleep talking should not lead to a suspicion of Parkinson disease on that basis. New, forceful episodes still need assessment.

Exploding head syndrome

With this phenomenon, someone hears a loud bang while falling asleep or waking even though there is no corresponding external sound. They may be startled or cry out. It is usually benign, but a new or unclear experience should be described to a clinician. Pain or accompanying neurological symptoms do not simply fit that reassuring explanation.

When sleep sounds point to a problem

Signs of obstructive sleep apnea

Loud snoring interrupted by silent breathing pauses and then gasping is particularly suggestive. Morning headaches, frequent waking and marked daytime tiredness can also occur. An older study of underdiagnosis showed that many cases were unrecognized at the time; it does not provide a current rate for every population.

Appropriate sleep testing can record airflow, breathing effort and oxygen levels. The sound is a clue, not the only measurement.

Other warning signs

Screaming together with forceful movements, injuries or new unusual behavior should be assessed, particularly if the pattern changes suddenly. Acute difficulty breathing, bluish discoloration or being very difficult to wake requires immediate help.

Sounds that may make sleeping easier

Steady background sound

A quiet, steady sound can make sudden outside noises less noticeable. Some people find that helpful; others find it distracting. It is not a reliable way to increase deep sleep, and the volume should stay comfortably low.

White, pink and brown noise

White noise distributes sound power evenly across equal frequency intervals and sounds relatively bright. Pink noise puts more emphasis on lower frequencies, while brown noise sounds deeper still. Rain, wind or water sounds are alternatives based on personal preference.

If you share a bed with someone who makes noise, you can try these sounds. Warning signals, alarms or a child should remain audible. With tinnitus, too, usefulness depends on the individual experience; no particular noise “color” is inherently superior.

Reducing unwanted sounds

Try a different position

Side sleeping may help with position-dependent snoring. A body pillow can make the position comfortable. The effect on catathrenia is less predictable. A quieter night also does not prove that possible breathing pauses have disappeared.

Address factors you can change

Treat a blocked nose according to its cause. Less evening alcohol may help breathing and sleep; a three-hour gap does not reliably eliminate every effect. For people with excess weight, weight loss may improve an obstructive component. It will not necessarily affect other causes of sleep sounds.

Drinking enough can ease dryness, but it does not treat sleep apnea. Slight upper-body elevation may feel comfortable; several pillows that only bend the neck sharply are less helpful.

When specialist help makes sense

Breathing pauses, gasping or substantial daytime sleepiness warrant a sleep-medicine assessment. Small studies have described treatments including CPAP trials for troublesome catathrenia; that decision comes after diagnosis. A broad blood panel cannot reliably distinguish between sleep sounds.

Frequently asked questions

Why do I make noises in my sleep?

Common explanations include vibrating airway tissues, sleep talking or brief arousals. Prolonged groaning may have another cause, such as catathrenia.

Why do I hum?

Catathrenia is one possibility, but not the only one. Duration, the breathing phase and accompanying symptoms help distinguish the cause.

Is occasional groaning normal?

It happens and is often harmless. Frequent distressing sounds or unusual breathing should be investigated.

Which background sounds help?

Quiet steady noise or nature sounds can mask outside noise. Personal preference matters; there is no single best sound for everyone.

Can sounds indicate sleep apnea?

Yes, especially snoring with breathing pauses and gasping. Testing is needed to confirm it.

How can I stop the sounds?

That depends on the cause. Side sleeping and treating nasal congestion may help; a breathing disorder needs targeted treatment.

Do sounds mean poor sleep?

Not necessarily. How you feel during the day, breathing patterns and accompanying movements matter more than sound alone.

Can stress play a role?

Yes, for example with sleep talking and restless sleep. A calm routine may help, but it does not replace assessment when warning signs are present.

Sources

• Vetrugno R, Lugaresi E, Plazzi G, Provini F, D’Angelo R, Montagna P (2007). Catathrenia (nocturnal groaning): an abnormal respiratory pattern during sleep. European journal of neurology, 14(11), 1236-43. https://doi.org/10.1111/j.1468-1331.2007.01954.x Source
• Alonso J, Camacho M, Chhetri DK, Guilleminault C, Zaghi S (2017). Catathrenia (Nocturnal Groaning): A Social Media Survey and State-of-the-Art Review. Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine, 13(4), 613-622. https://doi.org/10.5664/jcsm.6556 Source
• Sixel-Döring F, Trautmann E, Mollenhauer B, Trenkwalder C (2014). Rapid eye movement sleep behavioral events: a new marker for neurodegeneration in early Parkinson disease?. Sleep, 37(3), 431-8. https://doi.org/10.5665/sleep.3468 Source
• Bjorvatn B, Grønli J, Pallesen S (2010). Prevalence of different parasomnias in the general population. Sleep Medicine, 11(10), 1031-1034. https://doi.org/10.1016/j.sleep.2010.07.011 Source
• Young T, Evans L, Finn L, Palta M (1997). Estimation of the clinically diagnosed proportion of sleep apnea syndrome in middle-aged men and women. Sleep, 20(9), 705-706. https://doi.org/10.1093/sleep/20.9.705 Source