Our time is managed; it is not our own. Psychologists Ryan, Hatfield, and Hofstetter (2002) report that while 75% of adults over the age of 65 consider themselves morning people, only 10% of those under age 65 feel that they can be categorized in this way. These subjective ratings for peak productivity times also correspond with data from objective measures of cognitive functions, including analytical thought and judgment, memory, and the ability to suppress irrelevant information (e.g., wandering thoughts) (68). That is, individuals over the age of 65 seem to perform better on tests of memory and concentration in the morning, while individuals under the age of 65 seem to perform better on these types of tests in the afternoon. This may be in part related to shifting sleep patterns over the course of the individual's lifetime and our accommodation of routines, but this phenomenon is not well understood. Ryan et. al. propose: