A vehicle can be configured to attempt to awaken a sleeping occupant when certain wake-up events have occurred. It can be determined whether a wake-up event has occurred. In one or more arrangements, the wake-up event can relate to the refueling of the vehicle (e.g., fuel level or recharge level). Sensor data relating to a vehicle occupant can be acquired. Based on the acquired sensor data, it can be determined whether the vehicle occupant is sleeping. Responsive to determining that the vehicle occupant is sleeping, the vehicle can cause a wake-up alert to be presented within the vehicle. The wake-up alert can be a visual, audial, and/or haptic wake-up alert.