I think this girl is sitting sideways on the chair.

[![enter image description here][1]][1]
 
I often say to my children "**are you sitting sideways on the chair?**" like picture 1 and then they invented this "**he is lying sideways on the bed**" when they saw this picture

[![enter image description here][2]][2]

can we say "**he is lying sideways on the bed**" as shown in the picture 2?







  [1]: https://i.sstatic.net/K7UtQ.jpg
  [2]: https://i.sstatic.net/vJeqR.png