Does it waste more battery if you put your ipod touch on sleep overnight or simply just powering it off?

when it is on stand-by it is still using about 10% of the battery as it is when turned on and being used, however when it is powerd-off it does not use any battery power however the battery power does slowly go down, ie if you turn it off fully charged and go back to it a few months later the battery will no longer be fully charged. so in answer to your question, turn it off when you go to bed, there is no need to leave it on stand-by apart from to waste battery and when you want to listen to it in the morning it does not take as long to load up.