First episode of REM sleep lasts minutes, followed by approx
{"Image DocumentName": "First episode of REM sleep lasts minutes, followed by approx", "Image ImageDescription": "First episode of REM sleep lasts minutes, followed by approx. 1 hour of slow-wave sleep. As night goes on REM episodes get longer and slow-wave intervals grow shorter \u2013 total cycle remains approx 90 minutes. A typical night\u2019s sleep will consist of 4-5 of these cycles.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}