universal in klal yisroel
I never fully understood why only Friday night do I feel that sleepiness during davening while the rest of the week I'm awake b"h?
Long day of rushing to prepare for Shabbos?
Big meal ahead of you makes you tired?
Longer maariv then usual? Meaning on a regular night any longer you would be out cold on the chair as well only to wake up for the visikin minyan which started.