DAE get up after sitting/laying down for a while and feel like you can't see or walk very well?

Like the other day I was laying down on my couch because my knee hurt, so I was laying down for about 3 hours because I couldent get up and when I did get up I couldent see or walk for about 10 seconds. I had to lean on a wall to stand, but the funny thing is my knee felt fine. Does this happen to you guys?