Alex and the others spent all night discussing tactics until morning. After they finished their preparation, Alex did not return to rest but continued to inspect the first division and the elite troops' training.
Humans, in general, could stay awake several days. But some can go to the extreme, for example, the American Randy Gardner holds the 'world record' for not sleeping for 11 days and 25 minutes. As for those who were in the military, generally, they only get 2- 4 hours of sleep while on duty and even less when they were out on patrol. It was not uncommon for special forces groups who were on duty to only get an average sleep of 2 hours per day for up to 10 days. Sleep was still needed by those who are in Mortal Realm. And once they reached the Sky Realm stage, sleep no longer becomes a necessity.
