You wouldn't wake up, so we had dinner before you.
You were still asleep, so we had supper first.
ーYou wouldn't wake up, so we had dinner before you.
「起きなかったから先に夕飯食べたよ」
to have dinner before ... で「…の前に夕飯を食べる」
ーYou were still asleep, so we had supper first.
「まだ寝てたから、先に夕飯食べたよ」
asleep で「眠って」
to have supper first で「先に夕飯を食べる」
ご参考まで!