A device comprising: an odor disperser adapted to disperse an odorant; and at least one sensor adapted to detect at least one of a physiological characteristic and a sleep characteristic of a user; a controller configured for: receiving inputs from the at least one sensor; and instructing the odor disperser to disperse an odorant responsive to inputs received from the at least one sensor during a sleep period of the user, wherein the odorant is selected to modify respiration of one or more upcoming breaths of the user; said device including a learning module configured for: monitoring respiratory patterns of the user and learn reactions to odor dispersions; and instructing the odor disperser, during the sleep period, to change any one of the type, dose, duration and time of odorant dispersed based on the effect of odor dispersions on the inputs; wherein the device further comprises: a reservoir configured for storing a plurality of different odorants, a mixer in which odorants from said plurality of different odorants are configured to be mixed, wherein each of said plurality of different odorants in said reservoir is associated with a dedicated valve and wherein said controller is configured to regulate a desired dose of an odorant from said plurality of different odorants to the mixer based on controlling said dedicated valve. an odor disperser adapted to disperse an odorant; and at least one sensor adapted to detect at least one of a physiological characteristic and a sleep characteristic of a user; a controller configured for: receiving inputs from the at least one sensor; and instructing the odor disperser to disperse an odorant responsive to inputs received from the at least one sensor during a sleep period of the user, wherein the odorant is selected to modify respiration of one or more upcoming breaths of the user; said device including a learning module configured for: monitoring respiratory patterns of the user and learn reactions to odor dispersions; and instructing the odor disperser, during the sleep period, to change any one of the type, dose, duration and time of odorant dispersed based on the effect of odor dispersions on the inputs; wherein the device further comprises: a reservoir configured for storing a plurality of different odorants, a mixer in which odorants from said plurality of different odorants are configured to be mixed, wherein each of said plurality of different odorants in said reservoir is associated with a dedicated valve and wherein said controller is configured to regulate a desired dose of an odorant from said plurality of different odorants to the mixer based on controlling said dedicated valve. receiving inputs from the at least one sensor; and instructing the odor disperser to disperse an odorant responsive to inputs received from the at least one sensor during a sleep period of the user, wherein the odorant is selected to modify respiration of one or more upcoming breaths of the user; said device including a learning module configured for: monitoring respiratory patterns of the user and learn reactions to odor dispersions; and instructing the odor disperser, during the sleep period, to change any one of the type, dose, duration and time of odorant dispersed based on the effect of odor dispersions on the inputs; wherein the device further comprises: a reservoir configured for storing a plurality of different odorants, a mixer in which odorants from said plurality of different odorants are configured to be mixed, wherein each of said plurality of different odorants in said reservoir is associated with a dedicated valve and wherein said controller is configured to regulate a desired dose of an odorant from said plurality of different odorants to the mixer based on controlling said dedicated valve. monitoring respiratory patterns of the user and learn reactions to odor dispersions; and instructing the odor disperser, during the sleep period, to change any one of the type, dose, duration and time of odorant dispersed based on the effect of odor dispersions on the inputs; wherein the device further comprises: a reservoir configured for storing a plurality of different odorants, a mixer in which odorants from said plurality of different odorants are configured to be mixed, wherein each of said plurality of different odorants in said reservoir is associated with a dedicated valve and wherein said controller is configured to regulate a desired dose of an odorant from said plurality of different odorants to the mixer based on controlling said dedicated valve. a reservoir configured for storing a plurality of different odorants, a mixer in which odorants from said plurality of different odorants are configured to be mixed, wherein each of said plurality of different odorants in said reservoir is associated with a dedicated valve and wherein said controller is configured to regulate a desired dose of an odorant from said plurality of different odorants to the mixer based on controlling said dedicated valve.