does anyone know if the solostar pens comes in half units.our daughter takes either 22 to 23 units and we think she needs 22 1/2 units.her bloods go high on 22 but low on 23 and last week she woke up in a hypo at 3.4 we followed the nurses advice keep her on 23 for 3 days but she woke up in a hypo.we will be speaking to the nurses just wondered if anyone knows if the pen comes in half units.