If any of the advice above didn't work and you still feel groggy, then yes you can do what Naomi has said (go to the doctor) or you should try to flush it out your system. Treat it as if you just had too much alcohol that night so what you do is you exercise to sweat and drink a lot of fluid to get it out of your system.

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this is not normal. go and ask your doctor for help..

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too much sleep.. that's what it is..

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Actually Hydroxyzine has a mild tranquilizing effect other than its anti-allergic functioning. This is why it is advised to avoid driving and other such activities that require caution when you are taking Hydroxyzine. The sedating effects are supposed to disappear soon.

Next time you can ask your doctor to prescribe a non sedating anti-histamine like Cetirizine if the level of tranquility is high.

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some things to watch out for with Cetirizine
serious side effects:
fast, pounding, or uneven heartbeat;
weakness, tremors (uncontrolled shaking), or sleep problems (insomnia);
severe restless feeling, hyperactivity;
confusion;
problems with vision; or
urinating less than usual or not at all.
Less serious side effects may include:

dizziness, drowsiness;
tired feeling;
dry mouth;
sore throat, cough;
nausea, constipation; or
headache.

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I think it is normal for I feel the same way after I sleep for too long.

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