There is provided an information processing device including: a sleep environment controlling unit configured to, when exerting control of, on the basis of a result of forecast of a transition of a depth of sleep of a user at least in a period from a first time to a second time, a sleeping environment of the user such that the depth of sleep at the second time falls below a first depth-of-sleep threshold value estimated as an upper limit of a first depth-of-sleep region in which the user is likely to awake, decide a temporal pattern of the control in the period from the first time to the second time in accordance with a temporal pattern of the transition.