Romastory Women's Stretched Shiny Sports Leggings Mid-Waist Elastic Pants Shining Leggings Tights

Are these see through?

what are the care instructions? There are no labels on the clothing to describe how to wash/dry them.

Do they run long? I'm 5'10" and need them to be a ankle

Does anyone think that these would make really comfortable sleep pants for either men or women, and how about pairing them with a leotard too?