Answer by taking a quote from the following article:

Francis Albert Sinatra was born on December 12, 1915, in an upstairs tenement at 415 Monroe Street in Hoboken, New Jersey. He was the only child of Italian immigrants Antonino Martino "Marty" Sinatra and Natalina "Dolly" Garaventa. Sinatra weighed 13.5 pounds (6.1 kg) at birth and had to be delivered with the aid of forceps, which caused severe scarring to his left cheek, neck, and ear, and perforated his ear drum, damage that remained for life. Due to his injuries at birth, his baptism at St. Francis Church in Hoboken was delayed until April 2, 1916.

Sinatra was known for his sense of style. He always dressed immaculately, both in his professional and private life. He felt that as he was the best, he had to give his best to the audience, and would wear expensive custom-tailored tuxedos on stage as a sign of respect and to look important. He spent lavishly on stylish pin-striped suits and other clothing, and later said that clothing made him feel wealthy and important, bolstering his ego. He was also obsessed with cleanliness--while with the Tommy Dorsey band he developed the nickname "Lady Macbeth", because of frequent showering and switching his outfits. His deep blue eyes earned him the popular nickname "Ol' Blue Eyes".  For Santopietro, Sinatra was the personification of America in the 1950s: "cocky, eye on the main chance, optimistic, and full of the sense of possibility". Barbara Sinatra wrote that "A big part of Frank's thrill was the sense of danger that he exuded, an underlying, ever-present tension only those closest to him knew could be defused with humor". Cary Grant, a friend of Sinatra's, stated that Sinatra was the "most honest person he'd ever met", who spoke "a simple truth, without artifice which scared people", and was often moved to tears by his performances. Jo-Caroll Dennison commented that he possessed "great inner strength", and that his energy and drive was "enormous". A workaholic, he reportedly only slept for four hours a night on average. Throughout his life, Sinatra had mood swings and bouts of mild to severe depression, admitting to an interviewer in the 1950s that "I have an over-acute capacity for sadness as well as elation". Barbara Sinatra stated that he would "snap at anyone for the slightest misdemeanor", while Van Heusen said that when Sinatra got drunk it was "best to disappear".  Sinatra's mood swings often developed into violence, directed at people he felt had crossed him, particularly journalists who gave him scathing reviews, publicists, and photographers. According to Rojek he was "capable of deeply offensive behavior that smacked of a persecution complex". He received negative press for fights with Lee Mortimer in 1947, photographer Eddie Schisser in Houston in 1950, Judy Garland's publicist Jim Byron on the Sunset Strip in 1954, and for a confrontation with Washington Post journalist Maxine Cheshire in 1973, in which he implied that she was a cheap prostitute. In contrast, Sinatra was known for his generosity, particularly after his comeback. Kelley notes that when Lee J. Cobb nearly died from a heart attack in June 1955, Sinatra flooded him with "books, flowers, delicacies", paid his hospital bills, and visited him daily, telling him that his "finest acting" was yet to come. In another instance, after an argument with manager Bobby Burns, rather than apologize, Sinatra bought him a brand new Cadillac.

did you find anything else interesting?
A workaholic, he reportedly only slept for four hours a night on average.