Awakenings movie plot

Leonard was originally a clever and happy teenager, but his body appeared to be ill, and his condition was getting worse, and finally he became a demented person. Decades have passed and the United States has entered the turbulent 1960s. Sachs, a biological research scholar, was hired by a mental hospital as a clinical therapist. Sachs, who could not adapt to his new job, accidentally discovered the characteristics of patients with dementia, which aroused His research spirit. After research, he found that a drug for Parkinson's disease (muscle tremor) can cure dementia patients. As a result, Leonard and other dementia patients returned to normal after using the drug, but after a miracle, they were sad. After Leonard awakened from decades of sleep, he found that he was facing the problem of retrieving himself, which caused him to conflict with the establishment of the hospital that restricted his freedom and dignity as a human being. Sachs also felt that compared with the care and respect of human nature, the effect of drugs was far from enough to make Leonard and other dementia patients completely healed. But it's too late: all dementia patients are back to their previous tape state.