Ask the Doctors | South China Morning Post
  • Mon
  • Mar 30, 2015
  • Updated: 9:07am

Ask the Doctors

PUBLISHED : Monday, 01 April, 2013, 12:00am
UPDATED : Monday, 01 April, 2013, 10:02am

Q: I know getting too little sleep is bad for you, but is it possible to get too much sleep?

A: For a healthy person, it is not possible to get too much sleep. Sleep is controlled by the brain under the influence of a chemical called adenosine and the circadian rhythm. Adenosine builds up during wakefulness and causes sleepiness. The level of adenosine is reduced in the brain when a body has had enough sleep, and this will cause the person to wake up. If a person is sleeping more than normal or feeling excessively sleepy, there may be an underlying sleep disorder.

Dr Ignatius Mark is an ENT surgeon and director of sleep services at Ascent Ear Nose Throat Specialist Group, Mount Elizabeth Medical Centre in Singapore


Related topics

For unlimited access to: SCMP Tablet Edition SCMP Mobile Edition 10-year news archive



Login Account