LEO day/night cycles are less than 2 hours, typically. An order of magnitude shorter, in other words. Satellites don't really have to expend any energy to stay

LEO day/night cycles are less than 2 hours, typically. An order of magnitude shorter, in other words. Satellites don't really have to expend any energy to stay "up", and thermal regulation is much easier in a vacuum than it is in the stratosphere.