The Sentinels they suggest a second opinion

Sleep forever... never walking again... the further you went in the forest, the more trees there were. Sarah thought about all of those times, when she had slept soundly, and, how opening your eyes and waking up had always been the logical sequence of events. So, what would happen, if she did not wake up? She had sometimes seen her parents and siblings sleeping, yet there was a big difference of, how they looked like and how this tiny dead mole looked. 

"Do they dream then? Always?" she asked, because it must be boring to sleep forever and see nothing.