then probably this is not 100% true... Tobi has only ninjutsu in standard attk in his description.. and he wake up the sleeping enemy with his standart ninjutsu attack. Try it for yourself.

really? I tried this vs kakashi clone, and my tobi keeps clearly wake up him

*, tomorrow I till test it again only using main / tobi and oboro clone.. he should do only nin dmg right?.
All vs kakashi clone and I'll check it out.
Also there's a way to keep the enemy sleep for 1 turn?. sometimes I manage to do that in arena but I'm not sure how this works.
For example. My main cast sleep to someone, and no one attack him... and the enemy don't have a support like kabuto to dispel it... Now the enemy in the next turn is able to do actions.
Is possible to sleep 1 target and leave it in sleep even at the start of the next round?.