Ohayou Gozaimasu used greeting from dawn until 10 o'clock in the morning, but it will not exceed 11 o'clock in the morning, water should be used, if it is clear, crisp sound that friends or close ones say only (OMI huh yo)
Ohayou Gozaimasu greeting used from dawn until 10 a.m. but will not exceed 11 a.m. should use fresh, clear tone. If a friend. Or someone close, say just (ohayou)