The walls in your dream are a literal picture of the figurative expression, "we've run into a wall." That means that your efforts to make progress have run up against an obstruction or difficulty. The dream reflects your feeling of frustration.
it means doing a wee up your wall in your sleep
It's just a dream so it doesn't really mean anything.
No, the compressions found on the slinky will be different before and after hitting the wall. Before hitting the wall, the compressions will be moving towards the wall. After hitting the wall, the compressions will be reflected back towards the source of the disturbance.
It means there's no communication. An invisible wall ("muro invisivel") between two people means that they are not talking between themselves ("talking" being not an act but pure non-understanding).
my car hitting a broken wall on the road next door
The Invisible Wall - 1947 was released on: USA: 15 October 1947
No, the Mythbusters have not tested the existence of an invisible electrostatic wall.
You will lose something minor/major. (an object, person, friend or etc...)
jump at a wall then jump again after hitting the wall
The Invisible Wall - 1947 is rated/received certificates of: USA:Approved (PCA #12541, General Audience)
Hitting the Wall - 2011 was released on: USA: 7 April 2011 (Houston Worldfestival)
The cast of The Wall Invisible - 1918 includes: Wanda Hawley Shirley Mason Matt Moore