A system and method for carrying out a remedial action based on monitoring driver attention of a vehicle driver. The method includes: obtaining driver attention sensor data from one or more driver attention sensors that are installed on the vehicle as onboard vehicle sensors; detecting a driver inattention event based on the obtained driver attention sensor data; determining one or more driver inattention metrics based on the obtained driver attention sensor data and in response to the detected driver inattention event; based on at least one of the driver inattention metrics, determining one or more remedial actions to be carried out; and carrying out the one or more remedial actions, wherein, when at least one of the one or more remedial actions is carried out, in-vehicle entertainment that is provided by one or more vehicle-user interfaces of the vehicle is restricted or prevented.