Information for Doctors

Are you a DOCTOR looking for more details about our practice?

Thoracic Medicine

Think you might have a breathing disorder or just looking for more information?

Sleep Medicine

Latest News

Sleep apnoea may make it hard for you to remember simple things, such as where you parked your car or left your house keys, a small study suggests.

Read more...
 

Researchers believe that disrupted circadian clocks are the reason that shift workers experience higher incidences of type 2 diabetes, obesity and cancer. The body's primary circadian clock, which regulates sleep and eating, is in the brain. But other body tissues also have circadian clocks, including the liver, which regulates blood glucose levels.

Read more...
 

In recent research is has been found that disruption to rapid eye-movement (REM) sleep caused by sleep apnoea, may affect an individual’s capacity to form new spatial memories.

Read more...
 

Office workers with more light exposure at work had longer sleep duration, better sleep quality, more physical activity and better quality of life compared to office workers with less light exposure in the workplace.

Read more...
 

Can you be sleep deprived without knowing it? Sleep is not always prioritised however the implications can be devastating. Even one night sleep deprived can be impacting your body on a variety of different levels; physically and psychologically. The only way to know if you are getting consolidated sleep is to monitor with specialised equipment what is happening when you are asleep.

Read more...
 

In what may be the largest study of sleep problems among individuals with multiple sclerosis (MS), researchers at UC Davis have found that widely undiagnosed sleep disorders may be at the root of the most common and disabling symptom of the disease: fatigue. Study paticipant reports of sleep disorder frequency, sleep patterns and complaints of excessive daytime sleepiness suggest that sleep problems may be a hidden epidemic in the MS population.

Read more...

Circadian Rhythms

A look at the body’s natural time cues

Most biological and psychological processes follow natural rhythms.

Those that have a cycle of about one day are called circadian rhythms.

What are circadian rhythms?

Circadian Rhythms

Most people have a normal cycle of waking up around 6-7am, going to work from about 9am-5pm, and then becoming sleepy and ready for bed by about 9-10pm.  They will sleep for approximately 8 hours before waking up again.

This process is called a circadian rhythm, and it is this natural rhythm that gets affected when we work shift work or experience jetlag.

Circadian rhythms influence our body temperature, sleep and wakefulness and various hormonal changes.

Sunlight and other time cues help to set our circadian cycles so that they are consistent from day to day. For most people the length of a complete cycle is very close to 24 hours.

The Science of Circadian Rhythms

Circadian rhythms are coordinated by small nuclei (centres) in the middle of the brain, the suprachiasmatic nuclei (SCN). The SCN are connected to other parts of the brain and helps control the body’s temperature, hormone release and many other functions.

A pathway runs from our eyes to the SCN and light seems to play the largest role in setting our circadian clocks.  Interestingly, blind people often report problems with circadian rhythms, since it is difficult for them to get the time cues needed to set their circadian clocks.

Other factors that may affect the SCN and the setting of the circadian clock include exercise, hormones and medications.

In healthy people the various circadian rhythms are “in tune” like the many instruments of an orchestra.

Body temperature, for example, starts to rise during the last hours of sleep, just before waking up. This may promote a feeling of alertness in the morning.  In the evening the bodies temperature decreases in preparation for sleep. A small drop in temperature also occurs in most people between 2pm and 4pm which may explain why many people feel sleeping in the early afternoon.

Although it has not been proven that changes in body temperature determine our sleep habits, there does appear to be a relationship between the two.

What causes circadian rhythm disorders?

There are many factors that can cause circadian rhythm disorders, such as:

  • Genetics
  • Age
  • Work and social commitments
  • Jet lag
  • Shift work
  • Delayed Sleep Phase Syndrome (DSPS) – Not being able to fall asleep until 2am or later.  This syndrome is more common in young adults.
  • Advanced Sleep Phase Syndrome (ASPS) - Sleepiness beginning in the early afternoon and therefore waking up too early and not being able to get back to sleep.  This is more common among older adults.
  • Irregular Sleep/Wake Pattern – the inability to adjust to a 24 hour period.
  • Sleep disorders – sleep disorders can be linked with snoring, diabetes, depression, heart disease, hypertension and stroke.  If you have any of these conditions and you are having trouble sleeping, it is important that you see a physician.

What treatments can help circadian rhythm disorders?

There are some methods you can do to try and maintain your circadian rhythm, even if you are a shift worker or traveller.

  • On the last few days of the evening shift, delay bedtimes and wake up times by one to two hours. As the night shift begins, workers will already be well on their way to adapting to the new schedule.
  • Try to allow extra time for adjustment during a trip or when switching to a new work schedule. Don’t skimp on the time for sleeping.
  • Depending upon the new time zone, a short nap at a specific time of day can be useful in help overcome jet lag.

Alternative Treatments

Bright Light Therapy

Bright light therapy is being studied as a way to shift the circadian system and reset the body’s clock. Properly timed exposure to bright lights may help advance or delay the sleep cycle.

Evening exposure to bright light can be used to treat ASPS by shifting the circadian clock to a later hour. Morning exposure to bright light is used to treat DSPS by shifting the circadian clock to an earlier hour.

If you think you suffer from one of these disorders, seek specific advice about this from your healthcare professional.

Supplemental Melatonin

Melatonin is a naturally occurring substance that increases in the bloodstream during the night. Although this form of treatment is experimental, it is believed to help promote sleep onset and rest the biological clock in some situations.

© copyright 2010 | All Rights Reserved | Web Design Brisbane by iFactory