The Welsh Ministers consider that is less likely to happen at the start of the school year as pupil fatigue will not be such a factor relative to at the end of the school year.
Mae Gweinidogion Cymru o’r farn bod hynny’n llai tebygol o ddigwydd ar ddechrau’r flwyddyn ysgol gan na fydd blinder disgyblion yn gymaint o ffactor bryd hynny o’i gymharu â diwedd y flwyddyn ysgol.