Sleep services

At Cromwell Hospital, our sleep service offers a wide range of tests including limited home sleep studies and the gold standard test for sleep investigations: polysomnography (PSG).

About our sleep services

Our service, which is physiologist lead, comprises of a multidisciplinary team. Our sleep and respiratory Physiologists work closely with consultants who work in the field of sleep medicine.

Common complaints which we investigate for include periodic limb movements, excessive daytime sleepiness, sleep apnoea, narcolepsy, and long sleep time complaints, as well as many other common sleep issues such as insomnia.

Why choose our sleep clinic?

Our service aims to provide expert, polite and thorough care. We work with a multidisciplinary team to ensure optimum medical care. In terms of tests, we have experience in carrying out a wide variety as listed below, in both the hospital and home setting. Results are typically reported by both physiologist and consultant within 7-10 days.

Our sleep services

Used as a tool to diagnose sleep apnoea. This portable sleep study is collected at the Cromwell and brought home with clear instructions for use. It monitors the respiratory and cardiac functions during sleep. It is often used when patients complain of snoring, excessive daytime sleepiness and/or witnessed pauses in breathing, also known as apnoeas. 

Used to investigate complaints of excessive sleep time, irregular sleep patterns and excessive daytime sleepiness, Actigraphy is a simple test that measures the 24 hour activity of an individual typically for 14 days.

It involves wearing an actiwatch which monitors light and activity to assess the 24 hour sleep-wake cycle.

Often referred to as the gold standard measurement of sleep, this test is used to investigate a broad range of sleep disorders and complaints including limb movement disorder, insomnia, parasomnias, and other uncommon sleep conditions.

The test allows physiologists to measure brain wave activity, muscle tone, limb, and eye movements as well as the respiratory channels measured in the ambulatory overnight oximetry. This study involves a video recording.

At the Cromwell, we offer this test as either an inpatient for a single night admission to our sleep room, or in the comfort of your own home (limited by proximity to Cromwell).

Used to diagnose central hypersomnia’s including Narcolepsy, this test involves a single night and day admission to our sleep room.

The study involves a polysomnography followed by 4-5 scheduled naps performed throughout the day. The aim of the study is to get an objective measurement of sleepiness.

The polysomnography is performed to rule out any possible causes of sleepiness and to ensure a reasonable sleep time has been achieved.

Performed as an inpatient, this study involves measuring transcutaneous CO2 in conjunction with the channels involved in ambulatory overnight oximetry. This study is suggested in patients with underlying respiratory illness and/ or those using non-invasive ventilation. It is also suggested in patients who are at risk of Obesity Hypoventilation Syndrome (OHS).

For all inpatient sleep investigations, we provide dinner and breakfast. Our sleep room is fitted with air conditioning, Wi-Fi, and a television. A private ensuite with wash facilities is also available in the room.

Book a sleep study with us

To perform any sleep investigations, we require a referral stating the reason for the test and some clinical history.

For ambulatory overnight oximetry studies, we can accept GP referrals which can be emailed to,

All other tests require a consultant referral which can be sent to

To contact the sleep clinic via telephone, please call +44 (0)20 7460 5561 between 09:00-17:00, Mon – Fri.

Paying for your treatment

We welcome both self-paying and insured patients.

Our locations

Book an appointment today

Our telephone lines are open 8am to 8pm Monday to Friday and 8am to 2pm Saturdays.

Please note - regrettably we are unable to answer specific medical questions or offer medical advice via email or telephone.