Hypersleep is a form of stasis for Organic beings.
Hypersleep involves pumping a special chemical in organic bodies. This substance causes the being to go into a coma, and slow biological functions, essentially hibernation. Said chemical also protects cells from frost burn, which is needed since inside a Hypersleep chamber, temperatures drop below freezing. As a result, occupants must in either the nude, near nude, or wear special garments to avoid having them freeze to the body.
The reason for this is either for emergency or because of the use of a Mass Drive, which causes organic material inside the field to artificially age when active.