what is a split night polysomnogram
Split Night Sleep Study. A split night sleep study is an overnight polysomnogram in which the patient spends the first half of the night being monitored for sleep apnea.
The pattern is more like waking than it is like NREM sleep. In a polysomnogram it is easier to tell a person is in REM sleep by looking at the electromyogram (muscle activity) and electrooculogram (eye movement). Sleepers in the REM stage appear immobile except for their breathing and fluttering eyes.The large skeletal muscles are paralyzed (atonia).he first REM period happens 70 to 90 minutes after sleep onset. At first these REM episodes are short (a few minutes), but as the night progresses, they become longer. Most REM sleep is late in the main sleep period (close to morning). A typical adult spends about an hour and a half every night in REM.