Insomnia may lead to increased heart rate and tachycardia, mainly due to the following reasons: 1. Poor sleep and exertion may lead to sympathetic hyperexcitation, which may lead to increased heart rate and tachycardia. 2. If the patient has previous underlying heart diseases, such as coronary heart disease, unstable angina, arrhythmia, etc., insomnia, exertion and lack of sleep may lead to heart attack. If the patient has a previous underlying heart disease, such as coronary heart disease, unstable angina, arrhythmia, etc., exertion and lack of sleep can lead to a heart attack, which can also cause a rapid heart rate, tachycardia, and the patient may show symptoms such as panic, chest tightness, shortness of breath, etc. 3, if the insomnia is combined with endocrine metabolic diseases, such as hyperthyroidism, poor sleep can cause tachycardia.