According to Running a House without Help
by Rose Henniker Heaton,
(first published in 1949 when people were having to get used to the almost universal problem of running a house without servants)
there are certain symptoms that appear when the patient is in urgent need of a holiday,
in order to avoid a breakdown.
One, when you feel sure the whole house will collapse without you.
Two, when you feel too tired to travel.
Three, when you cannot sleep for planning.
Four, when you order the same dish five days running.
Five, when you simply cannot stand a crowd of people.
Six, when you cannot bear to be left alone for a minute.
" The sun will set without thine assistance."