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over dose results in acute symptoms and it don't cause long term effects. It has also no side effect of increased sleepiness. You are on anti depressants and you are taking doses in less amounts. The reason behind sleepiness may be due to low dose of antidepressant the symptoms of depression
have flared up resulted in atypical features of depression like Hypersomnia
. I advise you to please start taking proper dose as prescribed by doctor. Don't modify doses by own. Control of depression will improve your symptomatology.
Dr. Seikhoo Bishnoi, MD