Are you sleeping?: sharing portrayed sleeping status within a social network.

Sunyoung Kim Julie A. Kientz Shwetak N. Patel Gregory D. Abowd Are you sleeping?: sharing portrayed sleeping status within a social network. 619-628 2008 CSCW https://doi.org/10.1145/1460563.1460660 conf/cscw/2008 db/conf/cscw/cscw2008.html#KimKPA08