I would like to suggest a simple feature that is the ability to enable or disable notifications to be displayed based on the sunrise or the sunset. 

Currently there are 3 options: during day time (from 8AM to 8 PM); during night time (from 8PM to 8AM) or using custom times set by the user.

The change I'm proposing is to match the "day time" option to match the sunrise until the sunset of the current location of the device (or at least approximately that location), and the same for the "night time" option. 

That mean that the hours would be slightly different on each day, matching the period selected by the user.

Currently i need to adjust that every week, to have notifications only at night time. 

That would be similar to what already exists in the smart actions feature, that can be enabled or disabled based on the sunrise or sunset.