  One population group that had to significantly adapt and change their
behaviour during the COVID-19 pandemic is students. While previous studies have
extensively investigated the impact of the pandemic on their psychological
well-being and academic performance, limited attention has been given to their
activity routines. In this work, we analyze students' behavioural changes by
examining qualitative and quantitative differences in their daily routines
between two distinct periods (2018 and 2020). Using an Experience Sampling
Method (ESM) that captures multimodal self-reported data on students' activity,
locations and sociality, we apply Non-Negative Matrix Factorization (NMF) to
extract meaningful behavioural components, and quantified the variations in
behaviour between students in 2018 and 2020. Surprisingly, despite the presence
of COVID-19 restrictions, we find minimal changes in the activities performed
by students, and the diversity of activities also remains largely unaffected.
Leveraging the richness of the data at our disposal, we discovered that
activities adaptation to the pandemic primarily occurred in the location and
sociality dimensions.
