There are a few possible reasons why a night light fixture (not an emergency light) might be circuited to a different panel from the normal fixtures in a building: Dedicated Circuit

The night light may be installed on a dedicated circuit to avoid affecting other lights on the normal circuit.

Backup Power

While it's not an emergency light, it could be tied to a panel that has a generator backup or some other form of backup power. The idea would be to keep some lighting on during a power outage for minimal visibility. This is unlikely unless there's a specific need, like illuminating a critical hallway.

Load Balancing

To balance the load across different panels, an electrician might distribute fixtures, including night lights, across multiple panels. This prevents one panel from being overloaded while another is underutilized.

Convenience

Sometimes it's simply a matter of convenience during installation. If the nearest panel with available capacity is different from the one the other fixtures are connected to, the electrician might use that panel.

Tenant/Ownership Division

In multi-tenant buildings, lighting might be segregated by tenant. A night light in a common area might be tied to a specific tenant's panel, or it might be tied to the landlord's panel, depending on the lease agreement.

Mistake/Unintentional

Sometimes, it's simply a mistake during wiring or a change made later that wasn't documented. This is less likely but possible.

Specific Requirement: There could be a specific requirement related to the building's use. For example, in a healthcare facility, a night light might be on a specific, monitored circuit for patient safety.To determine the actual* reason in a specific situation, you would need to consult the electrical drawings for the building or trace the wiring back to its source panel. Flag for review