Times/Places in where its socially acceptable to be asleep in the presence of other people:
* The primary of your own home: for example, falling asleep watching a movie late at night
* Sometimes at your friend's/family's house
* On a beach or in a park while sunbathing or picnicking.
* In an airplane seat
* In a train seat
* In a car (as a passenger)
* Waiting for a plane/train in an airport/terminal
* Studying in a college library