Why don't my friends at home sleep?

Are my friends at home sleeping?

I think my friends don't sleep because one friend texted me when it was 12:46 PM here and it was 4:46 AM at home. I think my friends should text after 8:00 or 9:00 AM. I think time differences are confusing because my friend texted me at one time, but I get it at a different time. How can 9 AM in Istanbul, Turkey and 9AM on the same day in Maryland, U.S.A. happen at different times? Because Earth spins and the sun rises at different times in different places.

General Information

Where we were.

{{ last_loc.name }} starting {{last_loc.whence | date:'yyyy-MM-dd'}}

Where we are.

{{ current_loc.name }} since {{current_loc.whence | date:'yyyy-MM-dd'}}

Where we're going.

{{ next_loc.name }} on {{next_loc.whence | date:'yyyy-MM-dd'}}