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Most sedative drugs have unknown mechanisms of inhibiting neuron cells in central nerve system. They help you to escape motion sickness by putting you into sleep (interrupting cell membrane function, to be more specific). Anti-cholinergic drugs (anti-N receptors) are the main anti-motion sickness drugs that may or may not bring a minor sleepy side effect (sedative effect shall we put it). None of the marketed sedatives is classified as anticholinergic drug.
The soldier boys with high levels of adrenaline (which is also anti-cholinergic by nature) in their blood will not fall into sleep or even feel asleep by taking anti-cholinergic pills (or anti-motion sickness pills).
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