Stasis

Stasis is a state of suspended animation in which a person subject to the process is chronologically frozen. The subject is unconcious, and cannot move, think, or speak. Stasis is usually used in extended relaxation centers.

Side Effects
Stasis has some known side effects. Being in stasis for a period of a couple months may cause cognitive deterioration, while staying subject to it for a couple years may cause serious brain damage. The effects of being under stasis for a short period of time are unknown.

Stasis In-Game

 * The player character, Chell, is put under stasis a number of times throughout the Portal franchise. In Portal, the game opens up with Chell having just awakened from an undefined time in stasis. At the end, she is put into stasis again by Doug Ratmann.
 * In Portal 2, the game also opens with Chell awakening from a period of fifty days in stasis. When she wakes up again after returning to stasis, it has been an extremely long time, too long for the announcer to compute.
 * In Portal: Prelude, Abby awakens from stasis at the beggining just like in Portal.