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Entry into the airport at night for an early morning flight

My partner and I have an early morning (6 am) flight from Budapest to India. Given that we would have to reach 3 hours early for our flight and we would be out till late night, we were wondering if it makes sense to not take a hotel that night and save some money. Can anyone share if the airport would allow entry around midnight-1 am for our flight at 6 am?