16th February 2025

An 80-year-old lady presents with excessive daytime sleepiness and reports poor sleep.

An 80-year-old lady presents with excessive daytime sleepiness and reports poor sleep. She does not share a bed with a partner. Her BMI is 29.

Polysomnography shows repetitive movements on EMG, lasting up to 8 seconds occurring during the first half of the night, occurring every two minutes during non-REM sleep, and intermittently associated with arousal. She has two apnoeic episodes per hour.

Her background includes hypothyroidism and hypertension.

What is the most likely diagnosis?

Select the SINGLE most appropriate option from the list below. Select ONE option only.