Question about Night Mode

I have a question about the energy saving mode within the night mode: What does it actually do to save engery and what are the drawbacks? (e.g. slower reaction time etc)
We have several doors with Nuki locks which are always aready locked twice and there’s no AutoUnlock enabled. So I’d enable the night mode only for battery saving.

The Bluetooth Advertising Interval is reduced to slow. This can lead to short delays when opening the App until the status of a Smart Lock is shown. Depending on how long the Night Mode is active, it can increase the battery life by 2-4 weeks.

Thank you for the clarification!