Nemui kunai

As before, Nemui remained asleep.
Standing up.

Was it an act? Or was he really sleeping? The only way to find out was to
just attack him directly.

Itachi pulled a kunai from his breast pocket and threw it. The blade flew in
a straight line toward the face of the sleeping Nemui.
His body, rocking from side to side, shook violently, and just barely
evaded the kunai.

Was he awake?
At any rate, the other boy’s eyes were closed, so Itachi couldn’t use the
sharingan.
Nemui stood upright, still sleeping, as though the attack of the previous
moment hadn’t happened. Just when Itachi noticed him swaying violently
once more, Nemui disappeared from his field of view again.

Book of Bright Light Chapter 3 Part 1