There is provided a method for improving comfort of an occupant of a vehicle, particularly for relieving motion sickness or carsickness. The method comprises receiving data from sensors S502 measuring the physiological properties of the occupant and data regarding one or more dynamic properties of the vehicle e.g. yaw, pitch, etc. In dependence on the received data, a probability of motion sickness of the vehicle occupant is determined S504 and this probability is compared to a threshold value S506. If the determined probability of motion sickness exceeds the threshold value S508, a vehicle orientation is determined and a datum e.g. artificial horizon, is displayed at a position within the vehicle in dependence on the determined vehicle orientation S510. The horizon may be projected onto the vehicle interior or displayed on a screen. The horizon may be displayed at an angle depending on the roll or pitch of the vehicle. The horizon may not be displayed if the occupant is asleep, and the threshold value may be dependent on the age, gender and motion sickness dose value of the occupant S505.
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