It's a good pillow, so Wei Ying's choice to rest on his lap is the right one. So, yes he can meditate.

"I chosen to. I can recuperate with meditation." It just that without his golden core, it will take a longer recovery time.

It's a good moment of peace, so he gently runs his fingers through his hair. After a few moments, he starts humming that song that Wei Wuxian knew so well, it's the song from the cave.