"Panic struck: he had to have air, had to breathe! Harry tensed his body, but the snow was like a boa constrictor that responded by tightening its grip. He knew he had to fight the panic, had to be able to think. And think now. The world outside had ceased to exist; time, gravity, temperature didn't exist. Harry had no idea what was up or down or how long he had been in the snow. Another of his father's wisdoms whirled through his brain. To find your bearings and determine which way you are lying, dribble saliva from your mouth and feel which way it runs down your face. He ran his tongue around his palate. Knew it was fear, the adrenalin that had dried out his mouth. He opened wide and used the fingers in front of his face to scrabble some snow into his mouth. Chewed, opened again and let the melted ice dribble out. He panicked instantly and jerked as his nostrils filled with water. Closed his mouth and snorted the water out again. Snorted out what was left of the air in his lungs. He was going to die soon."
The Leopard, by Jo Nesbo (copyright 2011; quote from pages 375-376 of the English language translation by Don Bartlett, Vintage Canada trade paperback edition).