After deploying a large number of sensors around his pod, Robert had allowed himself a bit of a nap. Or allowed? He had been dead tired after having been awake for almost forty hours in total. After setting up the sensor perimeter and after fine tuning a set of alarms to barely restrain from triggering each time that a bigger piece of debris hit the closest debris dumping crater some 500 km from his current position.

allowed -> needed
total. After -> total, after