The Jacket by Jack London

Suspended animation is nothing new, not alone in the vegetable world and in the lower forms of animal life, but in the highly evolved, complex organism of man himself. A cataleptic trance is a cataleptic trance, no matter how induced. From time immemorial the fakir of India has been able voluntarily to induce such states in himself. It is an old trick of the fakirs to have themselves buried alive. Other men, in similar trances, have misled the physicians, who pronounced them dead and gave the orders that put them alive under the ground.

As my jacket experiences in San Quentin continued I dwelt not a little on this problem of suspended animation. I remembered having read that the far northern Siberian peasants made a practice of hibernating through the long winters just as bears and other wild animals do. Some scientist studied these peasants and found that during these periods of the "long sleep" respiration and digestion practically ceased, and that the heart was at so low tension as to defy detection by ordinary layman's examination.