I have had similar experiences, especially with other python species like retics and burms. What we call a 'feeding response' is really a complex interplay of various physiologic functions. There is a whole cascade of neurological and hormonal events that take place to ready the snakes system to first catch, and then digest a whole animal prey item. Many times, once this system is ramped up, it has a hard time dissipating.
This is analogous to the flight or fight mode people experience when in a dangerous or stressful situation. The sympathetic nervous system releases adrenergic chemical messengers that dilate bronchioles and increase heart rate. Once the threat is diminished, the cholinergic parasympathetic nervous system takes over, slows breathing, and ramps up digestive functions. However, if you have ever experienced this, you know that it can take some time, even after the threat is gone to regain normal heart rate and breathing. Some snakes just deal with it better IMO.
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