&gt; the dark side of the Moon<p>... is not really a thing, BTW.  Earth&#x27;s moon is tidally locked to Earth, so one lunar cycle (synodic period, about 29.5 Earth days) is approximately one lunar day.<p>You&#x27;d need to build a train on the moon to keep your cryo chamber in the Moon&#x27;s shadow, or something similar.  I doubt you&#x27;d save energy by doing so.