if you were laying completely flat it might feel strange, but in the bb you're upper torso is already inclined slightly, bending the knees slightly and having something soft under them is the perfect compliment, and it does bring your lower back into a more comfortable position like BB mentioned earlier.
'Classic.' A book which people praise and don't read.” ― Mark Twain
Who cares about showers, gourmet food, using flush toilets. Just keep on walking and being away from it all.
There are times that the only way you can do something is to do it alone.
Apparently, signature that I used from 2006 no longer tolerated so now deleted.