[Spareribs]

Typically, when you go out in public, people are alert and lively like how you see people on TV.
 
But if you take a subway at 6 AM, you will notice that many people will be sleepy and drowsy. Some people will be nodding off in public. So yeah, if you want to see a bunch of sleepy strangers, the subway at 6 AM is the perfect place.

 

[TwinQY]

And sometimes they fall asleep on you!

 

[Spareribs]

Yes that can happen.

On a rare occasion, I'll see someone in a deep sleep with their mouth completley wide open with their head tilted back. It's as if they were a dead person.

I remember seeing this one lady sleeping in a very busy building lounge with her mouth completely wide open and hundreds of people walked by her since it was by a walk way corridor. Maybe someone took her picture. I don't know how some people can sleep with their mouth so wide open.

 

[TwinQY]

I fall asleep outside all of the time (with my mouth open!). On the bus, in the park. It's the ambient noise.