my ds was 4 in april this year and has always been a great sleeper until recently,he has started screaming at bedtime yelling i dont want to go to bed or im not tired.he has never done anything like this before and i haven't a clue what to do with him.He is usually absolutely exhausted and hardly able to keep his eyes open when i tell him its bedtime, i have tried telling him ten and five minutes before that he is going to bed but it doesn't make any difference.Any advice would be wonderful as they are going back to school next week so him fighting over bedtime is not what i need right now.