1. A method for delivering a drink to an individual, comprising: connecting the drink to an unmanned aerial vehicle (UAV); flying the UAV to an area including a plurality of people; scanning the people, using one or more sensors connected to the UAV, the one or more sensors connected to an electronic processing circuit which identifies an individual among the people that may have a predetermined cognitive state including determining a confidence level corresponding to a probable desire of the individual for the drink, based on sensor data and using sleep data pertaining to sleep experienced by the people when selecting the individual that may have a predetermined cognitive state; and if the confidence level reaches a predetermined level, flying the UAV to the individual that may have the predetermined cognitive state to deliver the drink to the individual.