Too often we confuse motivation with external forces, but the most lasting, fulfilling kind of motivation comes from within.

Wonder why babies nap on some days but not on others? Or why older people wake up earlier? Mathematical modelling of sleep regulation provides some surprising answers to these and other questions, ...

However, randomness does not mean uniformity. In our dataset, we observed streaks, clusters, and cyclical patterns that, while not predictable in the short term, suggest tendencies that players often ...

For example, the annual GDP of a country may have an upward trend and a cyclical pattern. Non-stationarity can make it difficult to model and forecast time series, as it violates the assumptions ...