My 3 year old son has been defiant more lately. He will run away when I tell him to do something he doesn't want to. He did this around bed time recently and I said ok you're going straight to bed so I put him in bed but he kept coming out until I threatened to spank him. I've done it only once and the memory seems to work when I threaten it. I really do not want to spank him or even threaten him with it. I'm a single mom and also have a 7 month old. It's tiresome.