Not dreams. Nebula didn't get dreams. She got replays.
But there was something weird going on with those.
"They put me back together," said Nebula, sparing Gamora (!) the gruesomer descriptives. Retightened the marionette's strings. Untelescoped the veins and wires. "Their mistake. I contacted your friends to meet them on Titan. But after that things get… confused."