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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Probably no significant damage.
However first 12 hours observation is critical for any delayed response, black outs, sudden headache onset.
Sleeping is ok as long as someone is watching over you and can wake you up normally.
Otherwise, better to go to ER if no one is around you.Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/