This study aimed to determine the sleep efficiency during the night time and day time sleep among Thai children in Thailand. Participants in this study were investigated by using DENVER II for measuring their usual development. The normal development participants were questioned about the sleep characteristics and were recorded the sleep log by their parents. The target population of this study was both male and female Thai children who were lived central part of Thailand. Data collection was conducted in a two-month period during February to March 2006. Twenty-seven Thai children were selected by purposive sampling. Sample size was based on the principle of Polit and Hungler (1995), who suggested the sample of 20-30 cases. The participants of this study were more girl (n=79, 58.52%) than boy (n=56, 41.48%). Their age ranged from 0-6 years with the mean and standard deviation of 3.19 and 0.50 years, respectively. More than half of the participants (n=85, 62.97%) were 0-3 years. Regarding to the health status, the result of this study demonstrates that the health condition of the children’s emotion and behavior prior the experimental procedures. Generally, more than half of the participants did not have any illness or disconfirm one week prior the experiment and were not under frequent medical administration. Most of the participants had positive emotion and friendly or socialization. Sleep environment of the children at home was the main factor in which might influence the children’s sleeping behavior and attitude of following or postponing the bed time. The result of this study shows that the participants are easy awaked during sleep via the environmental influence. More importantly, it can be significantly altered the sleep cycle of the children and effect the results of the study.

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