Why does obstructive sleep apnoea cause daytime sleepiness?

During obstructive sleep apnoea, the throat relaxes enough to narrow or close the airway while you are asleep. Your body reacts by making a brief arousal to reopen it. You may not remember these arousals, yet they can interrupt deeper stages of sleep many times across the night. Snoring, gasping, waking with a dry mouth, and unrefreshing sleep can occur alongside this pattern.

Daytime Sleepiness is a very common presentation of Obstructive Sleep Apnoea. Sleepiness can show up as dozing during quiet activities, struggling to stay alert in meetings, or needing extra effort to drive safely. It has several possible causes, so it does not by itself identify the reason.

Arrange a medical review if sleepiness is persistent or someone has noticed loud snoring, pauses in breathing, or choking sounds during sleep. A clinician can review medicines, sleep habits, nasal blockage, and other contributors, and may arrange a sleep assessment. Avoid driving or operating machinery when you feel drowsy. Keeping a short record of sleep times, awakenings, naps, and witnessed breathing changes can make the appointment more useful.

Seek prompt medical advice when sleepiness is affecting driving, work safety, or daily functioning. Get urgent help for sudden severe breathlessness, chest pain, fainting, or new weakness or confusion; these symptoms need assessment for causes beyond a sleep problem.

Could my sleep pattern and symptoms fit obstructive sleep apnoea, and would a sleep assessment help? What changes should I make while I am waiting for assessment? Could any medicines, alcohol close to bedtime, nasal symptoms, or another health condition be worsening my tiredness?