Talk about being healthy and fit here

I saw a viral video about a navy seal method of taking a nap for 8 minutes which included elevating your legs; the idea being that it makes it easier or better for blood to flow and relaxes you
 
Such elevation can be done by putting the legs at a 90 degree angle on to a chair, bed, or other surface, or greater angles with smaller stacks of pillows
 
I also saw some articles about possible benefits of sleeping this way
 
So, have you tried resting with elevated legs at all or have any thoughts on the practice?