Is it Necessary to wait at night to do a update software update

You can update your devices at any time the update is available. A manual update can be performed at any time

Automatic updates will only occur when the iPad is connected to both WiFi and its Power Adapter - and the iPad is locked. These conditions are perhaps most likely to occur when the device is charging overnight - and is otherwise idle.

There is no technical benefit to leaving an iPad to update while unattended.

steamstir wrote:

Is it necessary to wait at night to update so to have it updated software session

no