The term 'drains strength from' can be summarized by the crossword solution SAPS, which is an acronym for 'Stress, Anxiety, and Physical Symptoms.' This term is used to describe a condition in which a person experiences physical and psychological symptoms due to prolonged stress or anxiety. These symptoms can include fatigue, headaches, difficulty concentrating, and difficulty sleeping. In some cases, these symptoms can lead to more serious health issues such as depression and heart disease.