I am suffering with panic disorder since 2009 and taking clonazepam 0.5 two times daily, provanol 20 mg two times and one antidepressant stalopam twice. It has become a routine and without taking this I feel uneasiness in head, palpitation and reeling head. After taking medicine I feel very sleepy. And at last I have to sleep for one hour minimum.

Yes clonazepam can cause sleep even if you've been taking it for a long period. To give you respite from sleepiness and other side effects your dosage regime need to be altered slightly. During this alteration you might have to tolerate few side effects for a few days but will definitely help you in the long run. Please make dose adjustments only when you can afford side effects for a few days. 

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