norwolf... I would say "I woke up with a bad headache, yet by evening, the pain had gone." Although "by the evening" would not be incorrect. It's just a matter of preference.
I am trying to learn to use definite articles and zero articles with reference to time this way: 1?words indicating time periods: morning, night, and so on. As usual, those words take the preposition in and the definite article the, because on this occasion, those time words perform their original meanings as everyone can see, and we use the, while the prepositi