For several years heading into the early 1960s, Monroe had been dependent on amphetamines, barbiturates and alcohol, and she experienced various mental health problems that included depression, anxiety, low self-esteem, and chronic insomnia.[2] She had acquired a reputation for being difficult to work with, and she frequently delayed productions by being late to film sets in addition to having trouble remembering her lines. By 1960, this behavior was adversely affecting her career.