Speak to your diabetic team, the only time they advised me to split was when changing from taking it in the morning, to taking it at night, so that it covered me for the 24 hours without taking too much in that period, sounds to me like either you need to reduce that dose with medical advice, or you are taking too much short acting insulin last thing with not enough to eat. Until you speak to your team, maybe try having a snack at bedtime to get you through