Back Nave dormitorio Spanish Lotegi espaziontzi Basque Nukkuja-alus Finnish Sliepskip Frisian Alvóhajó Hungarian Nave dormitorio Italian Slaapschip Dutch Nave dormitório Portuguese Спящий космический корабль Russian Sovrymdskepp Swedish
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A sleeper ship is a hypothetical type of crewed spacecraft, or starship in which most or all of the crew spend the journey in some form of hibernation or suspended animation. The only known technology that allows long-term suspended animation of humans is the freezing of early-stage human embryos through embryo cryopreservation, which is behind the concept of embryo space colonization.