A great place to start Disorder information source Rated and Reviewed Sleep Links Entrance to all monitored Sleep Forums Search all of Sleepnet.com


Sleep Apnea
Forum Posting


Archived Apnea Forum111 viewing only. To post a new topic go to the Apnea Forum Homepage.

Re: Polysomnogram Completed!

Posted by Sleepyrick on March 20, 2003 at 08:12:18:

In Reply to: Polysomnogram Completed! posted by TheShoe24 on March 19, 2003 at 12:30:23:

Yes, REM occurs within the first 90 minutes in normal sleep. No, the first night's sleep in the sleep lab is not normal sleep. It is well known among sleep labs that many patients will sleep less total time, with more arousals, and quite possibly not have any REM in the first sleep cycle when in the lab. The is known as the "first night effect" and occurs anytime, anywhere when one sleeps in a different situation than you are used to in recent days. This could be at the sleep lab, at a relative's house, or anywhere else.
Even if you did have your usual REM sleep in the first sleep cycle, that REM sleep usually only lasts a couple of minutes. It is not until later in the night that significant REM occurs, usually in the last 2-3 sleep cycles, in the last 2-4 hours of the night.

Follow Ups:


Archived Apnea Forum111 viewing only. To post a new topic go to the Apnea Forum Homepage

  • IMPORTANT : Information not intended as medical advice. If you suspect that you have a sleep disorder you should seek care from a qualified professional. Read Terms of Use.
  • The Sleep Forums are not to be used for commercial purposes.
  • Commercial products and services are not endorsed by Sleepnet.com.
  • Sleep Deprivation due to Sleep Apnea and insufficient sleep are common and can present as insomnia, narcolepsy, or idiopathic hypersomnia. In infants and children sleep problems commonly present themselves as ADD or ADHD.


Copyright ©1995-2005 Sleepnet.com., All rights reserved