Question

みこと

Maybe they are tired what with all the sleep they are losing staying up night after night.

日本語訳をお願いします！
(what with A…Aのために/せいで)

Answer 1

taka

Maybe they are tired what with all the sleep [(which/that) they are losing <staying up night after night>].
多分彼らは、〔＜毎晩遅くまで起きているせいで＞失っている］睡眠のために疲れているのだろう。
※stay up 夜遅くまで起きている night after night 毎晩

【構文】　
①関係代名詞：目的格の省略： … all the sleep(名詞) [(which/that) they are …. 先行詞：the sleep　
②分詞構文：<staying up night after night> ＝ because(接続詞) they(s) stay up(V) night after night

参考にしてください。