Boaters know this feeling: it's a slight feeling of disorientation on land after spending a lot of time on a boat. Especially in the shower, for some reason, it feels as if the room is rocking back and forth ever so slightly.
I sort of remember a similar sensation after ice skating, oh so many years ago. Walking in street shoes after gliding on ice was like a mermaid becoming mortal. My feet felt weird, sluggish, sticking heavily to the ground.
I've been traveling a lot lately and getting disoriented in hotels has become a common occurrence. Last night, I woke up and I wasn't sure of where I was at first and I was in my own bed!
Don't worry. It'll wear off.