Difficulty getting a firm erection is usually due to factors like stress, anxiety, fatigue, poor sleep, or medical conditions such as diabetes, high blood pressure, or low testosterone. Lifestyle habits like smoking, alcohol use, and lack of exercise can also affect it. Improving sleep, reducing stress, regular exercise, and a healthy diet can help, and in some cases medicines like Tadalafil may be advised. If the problem is frequent or persistent, consult a doctor to find the exact cause and get proper treatment.