Introduction: Sleep is very important for all, but especially for infants. In their sleep they grow and develop. There are big changes in the rhythm and duration of sleep, sleep patterns, awareness and structure of sleep in the first few months of infant life. Purpose: It is to present all the factors that influences on infant sleep. The main purpose of this diploma is to answer the question of research: about difference of sleep between breastfed infant and non breastfed infant, the connection between sleeping habits of infant and mothers lack of sleep, influence of a diet on a infant sleep, influence of sleeping space on a infant sleep and integration in putting a infant to sleep. Methods: We used a descriptive research method. We researched the literature with the help of international web data base CINAHL withFull TEXT, CochraneLibrary, MedLine, ScienceDirect in COBIB. SI. We accessed through NUK's remote access network. We used articles between years 2007 an 2017. Results: Breastfed infants awake more often than non breastfed infants. Breastfeeding mothers are waking up through the night more often than non breastfeeding mothers, without disturbing their daily sleepiness. It was concluded that mothers believed that breastfeeding was the best nutrition for infants’ growth and the establishment of the immune system. Most studies show, that infant who sleeps with his parents wakes up more frequently. Discussion and conclusion: In studies, we found that infants do not divide them selves between day and night at the beginning of their lives, nor do they have regular rhythm and sleep duration. Just after the age of three months sleep and rhythm of the infant begins to prolong. Mother’s milk is very rich with nutrition’s and antibodies, also it is better digestible than the milk formula. Therefore, breastfed infants awake more often than infants fed with milk formula. Sleeping in the same room promotes the bond between mother and infant, as well as the infants’ sense of his mom with smell and hearing. This helps him to fall asleep.