"Of course I dreamed. The cold let the outside in, that was it. The outside. All the night I built this to hide us from. Just a drop, at first, one grain of night seeping in, drawn by the cold." (15.79)
The Tessier-Ashpool family use cryogenic tubes to isolate themselves from time and the outside world, so they can extend their family's influence through the decades. This sounds great, in theory, but think of all the things you'd miss. New lolcats, the Oscar award ceremony, Superbowl commercials, you know, the important things in life.