 In this context, we address two interconnected research questions: Can variations of online activity cycles provide information on the impact of lockdown on human activities? How do onlinecircadian rhythms react to such a disruption? Data: We base our research on the analysis and comparison of two independent databases about the French cyberspace: a fine-grained temporal record of  YouTube videos and a large collection of Tweets on Covid-19%DIFDELCMD < }%%% . Findings: In both datasets we observe a reshaping of the circadian rhythms with a substantial increase of night activity during the lockdown.
<clarity>  In this context, we address two interconnected research questions: Can variations of online activity cycles provide information on the impact of lockdown on human activities? How do onlinecircadian rhythms react to such a disruption? Data: We base our research on the analysis and comparison of two independent databases about the French cyberspace: a fine-grained temporal record of  YouTube videos and a large collection of Tweets on Covid-19%DIFDELCMD < }%%% . Findings: In both datasets we observe a reshaping of the circadian rhythms with a substantial increase of night activity during the lockdown.
 Firstly, we investigate the changes that this upheaval has caused in online activity in terms of time spent online, themes and emotion shared on the platforms, and rhythms of content consumption. Secondly, we examine the resilience of certain platform characteristics, such as the daily rhythms of emotion expression. Data. Two independent datasets about the French cyberspace: a fine-grained temporal record of YouTube videos and a large collection of Tweets on Covid-19%DIFDELCMD < }%%% . Findings: In both datasets we observe a reshaping of the circadian rhythms with a substantial increase of night activity during the lockdown.