Viktor Frankl calls it “Sunday neurosis.”
He defines it as, “That kind of depression which afflicts people who become aware of the lack of content in their lives when the rush of the busy week is over and the void within themselves becomes manifest.”
The calendar week is a social construct. There is no difference between Sunday and Monday other than the invented social norms that go along with each day.
If your Sundays are getting too scary, it might be time for a change.
Source: Viktor Frankl, Man’s Search for Meaning.