Background and Purpose: Vitamin D inadequacy is related with a higher danger of sleep aggravations. The specific system and connection between sleep quality and Vitamin D levels is as yet not completely comprehended. Vitamin D receptors are found in spaces of the mind stem to manage the sleep wake cycle. The age of 20-30 years is a productive age so they must have a good quality of life by maintaining quality sleep. Method: The design of this research is literature review by literature from NCBI, Pubmed,and Google Scholar having 5370 abstracts, which were independently evaluated by pairs of raters. Review article specific with vitamin D and sleep disorder in young people healthy was conducted on 38 studies of 560. Result: Based on review the mechanism of sleep is regulated in the suprachiasmatic core of the nerve center (SCN) by the section of daylight through the retina. This is as per exploratory examinations which express that the circadian clock is impacted by changes in light, temperature and Vitamin D. Vitamin D receptors are situated in the front and prevalent nerve center, substantia nigra, midbrain, cores raphe and the pontisoral and caudal cores. These regions are known to utilize pacemaker cells to assume a significant part in the primary phases of sleep and in keeping up with sleep. Daylight helps the blend of Vitamin D and the circadian cadence with the goal that Vitamin D communicates light motions toward control circadian rhythms. Conclusion: There is a significant relationship between vitamin D and sleep disturbances at the age of 20-40 years.

Introduction/aim: Serum vitamin D level, estimated as 25(OH) D, is related to an increase in number of physiological mechanisms of sleep. The circadian period of the sleep can be deferred with sun exposure and vitamin D supplementation. The mechanism of lower vitamin D level causing sleep disturbances is unknown, several possible mechanisms have been proposed. Receptors of vitamin D are commonly found in most human tissues, including central nervous system. Low level of vitamin D is related with an increased risk of sleep problems, such as low sleep quality, short sleep length and excessive drowsiness. This study aims to Methods: This study is an analytical study with a case-control design in resident st Sanglah Hospital from July-September 2021 Result: A total of 54 subjects were divided into case and control groups, age 25-35 years. From the statistical analysis using SPSS program on bivariate analysis with Chi-square obtained OR 12.6 (95% Confidence Interval=3.4-46.0; p=<0,001). Multivariate analysis showed that cortisol serum had P-value <0,001 Conclusion: Deficiency serum vitamin 25(OH) D levels increase risk factors of poor quality sleep thirteen times in resident at sanglah hospital Keywords: poor sleep quality, resident, vitamin 25 (OH) D, young people.