Was there a detectable sleep cycle at the other end of events?
Edit to clarify:
After becoming aware of the attacker, and since you followed some of their actions as they unfolded, did you notice anything resembling a biological cycle, both day-to-day and retrospectively? E.g: Eating (1-2 hour breaks), sleeping (8 hour inactivity pattern), "power naps" (90 minutes), etc...?