Early morning refers back to the time shortly in advance of sunrise at the same time. If You should get up at 6am even so the sun does not increase until 8am, I feel anybody would simply call 6am "morning". Stuart File "Day and night time" is much more ambiguous https://cashpb975.suomiblog.com/a-review-of-night-gangnam-퍼펙트가라오케-karaoke-guide-53588982