Believe it or not, i thought about it before typing it. Wrong obviously. But here is the thinking log:
"Wait, is dawn the morning or the evening? Hm, pink floyd lyrics say 'the dawn mist glowing', gotta be the morning. Shall i google? Oh wait, Tarantino says 'from dusk till dawn', dawn is last, it is the evening, not googling it".
Idiot, you've seen this uber-cult film many times, it describes the happenings of a night, it ends with the morning.