The dip afterwards is associated with a molecule called dienorphin, which is the opposite of endorphin and involves pain in the body. So for every bit of pleasure that we get from pursuit and getting the thing that we were pursuing, the crash that comes afterwards feels painful. We need to do in order to return to a baseline of dopamine, renew that resource, is to wait and make sure that we don't try and trigger yet more dopamine in that time. You can tell if somebody has a lot of dopamine and adrenaline in their system just by looking at them, their pupils are big.