If it's not illness or teeth I'd try and talk through the bedtime process, explainging what's happening, being comforting and gentle but not necessarily changing any of what your routine has been. Calmly and quieting say things such as... it's ok it's bedtime, we've had a big day, we need sleep to get some energy for tomorrow, recap the day. All along though making him understand that it's bedtime and there's no negotiating If you can get him to calmly lay in bed maybe try and stay with him for as long as you feel he needs and then start coming and going reassuring him you'll be back, give him a few mintues or so and go back and hopefully bedtimes will settle again. I'd do lots of reassurance during the night time wakes too while all along explaining it's bedtime and it's not time to get up. It's extreamly exhausting i know, DD has only now in the last 6 months finally settled into a great sleep routine.