僕は再び目を閉じた。

。

I closed my eyes again.

Literal

I [topic-は] again eyes [object-を] closed.

再び (ふたたび, 'again') is a more literary adverb than また. 目を閉じる ('to close one's eyes') — 閉じる means 'to close, shut.' The literary flavor of 再び suggests a narrative context.