If your students always talking or singing or sleeping in the cl,what can we do?

I would let them know that is dis ruptive and disrespectful to sing during class they can do it at recess or break. I would also try to sometimes work some singing or playing into the lesson, since they obs=viously enjoy this. Tell them the class singing and talking are limited to these times. I don't know what grade level you teach but you could give them a choice of singing or just saying their multiplication tables for instance. i would let them know that if it gets too silly though you'll have to stop.

I found school to be horribly boring and usually slept through most of my classes. Some of it may be because the student is just really tired, but for most it is probably just not engaging enough. Try to make activities for them to do that gets them out of their seats and participating and creating. Some subjects are easier to do this with than others!