12131 Sleep Study Polysomnography

Overview

A sleep study, also called polysomnography, is a test that records what your body does while you sleep. It is not a treatment and it does not diagnose you by itself. It helps your doctor understand why you sleep poorly, why you feel very tired in the day, or whether your breathing changes during sleep.

Sleep studies are common. They are a routine test in sleep clinics and are used for people of all ages.

Anyone can need a sleep study, including children, adults, and older adults. It is more often suggested for people who snore loudly, have pauses in breathing during sleep, or feel very sleepy during the day.

Symptoms

Common symptoms

• Loud snoring most nights
• Pauses in breathing during sleep that a partner notices
• Waking up gasping or choking
• Restless or unrefreshing sleep
• Feeling very sleepy during the day
• Falling asleep during quiet activities, like reading or watching TV
• Morning headaches
• Dry mouth when you wake up
• Trouble falling asleep or staying asleep

Symptoms in children

• Snoring most nights
• Long pauses in breathing during sleep
• Sleeping in unusual positions
• Bedwetting after being dry at night
• Poor attention, behavior, or school performance
• Slower growth or weight gain problems
• Morning headaches
• Daytime tiredness or falling asleep at school

Symptoms in older adults

• New or louder snoring
• Daytime sleepiness or falling asleep while sitting still
• Confusion or memory problems that are worse when sleep is poor
• Unsteady walking or falls
• Morning headaches
• Dry mouth when waking
• Needing to pass urine often at night

Causes

Main causes

• Suspected obstructive sleep apnea, where breathing briefly stops many times during sleep
• Central sleep apnea, where the brain does not send normal breathing signals during sleep
• Narcolepsy, a condition that causes very strong daytime sleepiness
• Restless legs syndrome, which causes uncomfortable urges to move the legs at night
• Sleepwalking, night terrors, or other unusual sleep behaviors
• Unexplained daytime sleepiness
• Heart rhythm changes during sleep
• Seizures that may happen during sleep

Risk factors

• Being overweight
• A large neck size or narrow airway
• Family history of sleep apnea or other sleep disorders
• Smoking
• Drinking alcohol close to bedtime
• Taking medicines that make you drowsy or relax your muscles
• Nasal allergies or a blocked nose
• Some hormone problems
• Age, especially middle age and older
• Being male
• Menopause
• Certain jaw, face, or genetic conditions

When to see a doctor

See a doctor urgently if:

• Someone sees you stop breathing during sleep, especially with blue lips or gray skin
• You fall asleep while driving or have a car crash because of sleepiness
• You have chest pain, severe shortness of breath, or fainting
• You have a sleep event that causes injury or confusion

Book a routine appointment if:

• You snore loudly most nights
• You wake up gasping or choking
• You feel very sleepy during the day even after a full night in bed
• You have morning headaches or a dry mouth most days
• Your partner notices pauses in your breathing
• Your child snores most nights or has breathing pauses
• You have trouble sleeping most nights for more than a few weeks

Diagnosis

Your doctor or a sleep specialist will ask about your sleep, health, medicines, and symptoms. They may ask your bed partner what they notice. If needed, they will arrange a sleep study. The results help your care team see what happens during sleep and choose the right next steps.

Tests that may be done

• Overnight sleep study in a sleep lab, called polysomnography
• Home sleep apnea test, a smaller test used when sleep apnea is likely
• Sleep diary kept for one to two weeks
• Questionnaires about sleepiness and sleep habits
• Actigraphy, a wrist device that tracks sleep and wake patterns over time
• Multiple sleep latency test, a daytime nap test used for certain sleep disorders

What to expect at your appointment

For a lab sleep study, you arrive in the evening and sleep overnight in a private room. A technician places small sensors on your head, face, chest, and legs. They are painless and do not use needles. The technician watches from another room. You can bring your own pillow and usual bedtime items. It may feel odd to sleep with sensors, but that is normal. You go home in the morning, and results are reviewed later. Do not stop any medicine unless your doctor tells you to.

Treatment

Treatment depends on what the sleep study finds. The goal is to improve sleep, protect your health, and help you feel more awake in the day. Your care team will explain the results and discuss options with you.

Self-care at home

• Keep a regular sleep and wake schedule, even on weekends
• Make your bedroom dark, quiet, and cool
• Avoid alcohol close to bedtime
• Avoid caffeine late in the day
• Quit smoking, or ask for help to quit
• Stay active during the day
• Try side sleeping if you have sleep apnea
• Keep a sleep diary to spot patterns
• Use any prescribed sleep device every night, as advised

Medical treatments

Treatment may include a breathing device for sleep apnea, a custom mouth appliance, positional therapy, behavioral therapy for insomnia, light therapy, or planned naps. Some sleep disorders are treated with medicines prescribed by a specialist. Ask your care team about the benefits, risks, and side effects of any option. A sleep study itself is not a treatment.

When is surgery considered?

Surgery is not usually the first treatment. It may be considered if a clear block in the nose or throat is causing sleep apnea, such as enlarged tonsils or a deviated septum. Weight-loss surgery may be discussed for some people with severe obesity and sleep apnea. Your specialist will explain if surgery is an option for you.

Living with this condition

Follow up with your sleep clinic and use your treatment every night. If you use a breathing device, clean it as instructed and keep it working well. Tell your care team if your sleepiness returns, your device feels uncomfortable, or your symptoms change.

Lifestyle tips

• Keep a regular bedtime and wake time
• Create a calm bedtime routine
• Keep phones and screens out of the bedroom near bedtime
• Avoid heavy meals and alcohol late at night
• Get regular daytime activity
• Ask your bed partner to note any breathing pauses or unusual sleep behavior

Diet and exercise

A balanced diet and regular activity support good sleep and healthy weight. Try to be active most days, but avoid intense exercise right before bed. If you are working on weight loss, ask your care team for safe support.

Mental health and emotional wellbeing

Poor sleep can affect mood, memory, and stress. It can make anxiety or low mood worse, and anxiety can make sleep harder. This is common and treatable. If you ever have thoughts of harming yourself, seek crisis support right away or call your local emergency number.

Prevention

Not all sleep disorders can be prevented. You can lower some risks by keeping a healthy weight, not smoking, avoiding too much alcohol, treating nasal allergies, and using medicines that cause drowsiness only as advised.

Vaccines

There is no vaccine that prevents sleep disorders or replaces a sleep study.

Screening programmes

Ask your clinician whether you need screening for sleep apnea if you snore loudly, have high blood pressure, or feel very sleepy during the day.

Complications

If left untreated

• High blood pressure
• Heart disease or heart rhythm problems
• Stroke
• Type 2 diabetes
• Car crashes or workplace injuries from sleepiness
• Poor memory, focus, or school and work performance
• Anxiety, low mood, or relationship strain

Long-term outlook

Most people can get answers and improve with the right treatment. A sleep study is a safe test, and it often opens the door to better sleep and better health. It may feel awkward to sleep with sensors, but technicians are trained to help you feel comfortable.

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