DS1 (3.8) has really been lashing out over Xmas, verbally and physically, from hitting DS2 to talking back and threatening to kick a lamp over if I didn't put the TV on 
He's normally a pretty gentle soul so just wondering (hoping!) that it's a testosterone surge or something, or maybe it's just the holidays? Anyone got brilliant ideas for dealing with it, we don't do the naughty step as I'm more the 'sit down and explain why it's wrong' persuasion but ten minutes later he's at it again...