The Novo rapid - advised 1 unit, only bought her down from about 20 to 15 last night. (over 5 hours period) She woke on 12.00. She's feeling better (her cold) but is still running high today. Is there a rule that you should only use rapid after a certain amount of time, after using normal doses (at breakfast and at dinner). If she's running high, say 1 hour after evening dinner, should I wait a certain time til I give Rapid. Also, when I tested her at 2.00am she was about 15, didn't know whether to give extra unit then or wait til morning. Ended up waiting, only because too anxious to give, incase she had hypo. For someone who has a masters degree, why can't I get my head round this rapid. (Probably cos the diabetic nurse/doctors did not advise me when she was diagnosed.