Questions & Answers about Вечерний отдых с книгой помогает мне засыпать.
The entire phrase вечерний отдых с книгой is the subject of the sentence.
- отдых is a masculine singular noun in the nominative case.
- вечерний is an adjective modifying отдых; it matches it in gender (masc.), number (sg.), and case (nom.).
- с книгой is just an additional phrase attached to the subject, not a separate subject itself.
Because the main noun отдых is singular, the verb помогает is in the 3rd person singular form:
- он помогает → (вечерний) отдых помогает
мне is the dative form of я (I → to/for me).
The verb помогать normally takes a dative object: it literally means “to help to someone.”
- кто? что? помогает — subject in nominative
- кому? чему? помогает — person being helped, in dative
So:
- Вечерний отдых с книгой (subject, nominative)
- помогает (verb)
- мне (indirect object, dative: “to me”)
Using я (nominative) or меня (accusative/genitive) would be ungrammatical here.