- by Medihope Super Speciality Hospital
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- Mar 20 2017
What is Polysomnography
Polysomnography watches your sleep stages and cycles to recognize if or when your sleep patterns are disturbed and why.
The normal procedure of falling asleep starts with a sleep stage is known as Non-Rapid Eye Movement (NREM) sleep. Throughout this stage, your brain waves, as registered by electroencephalography (EEG), slow down significantly.
Your eyes do not move back and forth speedily during NREM, as compared to later stages of sleep. After one or two hours of NREM sleep, your brain activity picks up again, and Rapid Eye Movement (REM) sleep starts. Most dreaming happens during REM sleep.
You usually go through four to six sleep cycles in a night. Cycling between NREM and REM sleep is about 90 minutes. Your REM stage generally expands with each cycle as the night progresses. Sleep disorders can upset this sleep process.
Polysomnography watches your sleep stages and cycles to recognize if or when your sleep patterns are disturbed.
Your doctor may advise polysomnography if he or she suspects you have:
Sleep apnea or another sleep-related breathing disorder:
In this condition, your breathing often stops and starts throughout your sleep.
Periodic limb movement disorder.
In this sleep disorder, you unconsciously bend and extend your legs while sleeping. This state is sometimes associated with uneasy legs syndrome.
You experience overpowering daytime sleepiness and unexpected attacks of sleep in this condition.
REM sleep behavior disorder.
This sleep disorder includes acting out dreams as you sleep.
Unusual behaviors during sleep.
Your doctor may carry out this test if you do strange activities during sleep, such as moving around a lot, walking or rhythmic movements.
Unexplained chronic insomnia:
If you regularly have trouble falling asleep or remaining asleep, your doctor may recommend polysomnography.
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