Too much exercise. First of all, the heat consumed by spinning bikes is generally between (300-500). If the coach teaches well, it may consume more, plus running. In addition, high-intensity exercise at night makes our cerebral cortex in a state of excitement, and the physical exertion will make our body feel tired but our nerves are excited, which is why you can't sleep. In the future, just reduce the intensity and feel comfortable, especially at night. Generally try to finish exercise before 9 o'clock.