This is the one that I have. Price  $22.00


This is a newer version of the above. Price  $21.48


A better view of the above.


Another view.  I do not have mine arranged this way.


A hang on the wall unit. CozyHoze


Another view of the CozyHoze  $20.00


This one looks interesting.  I would like to try it. $66.00


Here is a video.  Quite impressive.


This article  talks about sleep apnea and chronic hypoxia.