By day: awake. Empirical social science research. For leisure: traveling, sports and arts.
By night: asleep (most of the time).
The Great Outdoors
Q&A for people who love being outdoors enjoying nature and wilderness, and learning about the required skills and equipment
Open Data
Q&A for developers and researchers interested in open data
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
History
Q&A for historians and history buffs
Stack Overflow
Q&A for professional and enthusiast programmers
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Economics
Q&A for those who study, teach, research and apply economics and econometrics
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Puzzling
Q&A for those who create, solve, and study puzzles
Academia
Q&A for academics and those enrolled in higher education
Super User
Q&A for computer enthusiasts and power users
Literature
Q&A for scholars and enthusiasts of literature
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems