A hyphen is part of the common spelling: daylight-saving time.
Many writers never divide a word, others do it frequently, with or without the hyphen.
The word 'nightcap' is spelled with and without a hyphen in the text.
Some compound words appeared both with and without a hyphen.
When used as adverbs they may be printed in italics without the hyphen.
Afterwards he asked people to worship the Life-Force; as if one could worship a hyphen.
The purser said that the dragon's name was Mrs. Scrivener-Yapling, with a hyphen.
They cling to the hyphen in such words as to-day and to-night; it begins to disappear in America.
The hyphen is used between the component parts of some compound words.
In any other sense the hyphen is only an attempt to connect two qualities which refuse to be connected.
1620s, from Late Latin hyphen, from Greek hyphen "mark joining two syllables or words," probably indicating how they were to be sung, noun use of an adverb meaning "together, in one," literally "under one," from hypo "under" (see sub-) + hen, neuter of heis "one."
A punctuation mark (-) used in some compound words, such as self-motivation, seventy-five, and mother-in-law. A hyphen is also used to divide a word at the end of a line of type. Hyphens may appear only between syllables. Thus com-pound is properly hyphenated, but compo-und is not.