Thank you for your suggestions and guidance. I've stopped Nuxvomica now. He had in fact stopped taking naps at the age of 2. I had come to know about food allergies and stopped all dairy products for him a year back. Then there was a great change in his sleep pattern and he was sleeping through the night (except for some bad days). Now for the past 4 months, his sleep has become bad again. (his early morning wakings have become quite frequent) I'm quite strict on his diet and I dont know what is causing this. He dosent seem to have sound sleep after 3.00 am and after sometime of turing in his bed, he finally wakes up at about 4.30 am (approx. after 6 hours of sleeping) and gradually becomes fresh. Again after 8 or 9 in the morning he starts feeling sleepy. This has badly affected his attendance in school. If I do manage to send him to school, he is quite restless and screams and is quite cranky there. It then becomes compulsory to let him take a nap in the afternoon (after he comes back from school) which again would lead to his problems at bedtime because he is quite fresh again.