Abstract: Embodiments of the invention relate generally to electrical and electronic hardware, computer software, wired and wireless network communications, and wearable computing devices for facilitating health and wellness-related information. More specifically, disclosed are wearable devices, interfaces, and methods to manage activities, including a sleep activity, responsive to physiological effect of a consumable. In one embodiment, a method includes receiving data representing an indication of consumption, and identifying an amount of a consumable portion. Also, the method includes receiving data representing a time of an event, and aggregating amounts of consumable portions to form an aggregated amount. A modified amount of the aggregated amount of the consumable portions can be determined, for example, as a function of a dissipation rate. The method can include predicting the modified amount at the time of the event, and causing presentation of a time at which a predicted amount conforms to the threshold value.