nitrogen narcosis

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A condition of confusion or euphoria resulting from increased levels of dissolved nitrogen in the blood, as that occurring in deep-sea divers breathing air under high pressure.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A condition of disorientation, intoxication and stupor caused by increased levels of dissolved nitrogen in the blood; occurs in divers breathing air under pressure; the "rapture of the deep".

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun confused or stuporous state caused by high levels of dissolved nitrogen in the blood