yes I do think pipiltin did sleep upstairs

Yes, the Pipiltin, who were nobles in Aztec society, often slept in the upper floors of the temples, which were reserved for them. These upper levels provided them with privacy and protection.

Yes, they were afraid of FLOOD. BTW, if you go to DCB and go to year 5, i go there too and it's HOMEWORK

The noble class is the smallest class in Aztec society. It consisted of a ruler (known as the taltoani),priests and lords. Lords included landowners and judges.

It depends on your point of view if he was good or bad but I can tell what he did during his government.

Montezuma basically tried to separate the nobility (pipiltin) from the commoners (macehuales), he wanted more power so he boosted his own status. He replaced the officials appointed by his predecessor for his own followers

Montezuma always supported the nobility, over the commoners who weren't favored during his rule, for example he eliminated the right of the macehuales to wear special clothing if they proved themselves in battle.