BS rising overnight

Morning @snowleopard It's fairly normal to expect your basal requirements to change from time to time, whether through the change in the seasons, illness, stress etc many factors will cause your requirements to change over time. I find if I do hypo overnight that my morning BG reading can be 10+mmol/l. I would suggest setting your alarm for a 3am test to see what this looks like first before making any adjustments, this will then tell you what's going on and give you the information you need to make any adjustments.

snowleopard said:

What could be causing the overnight rise?

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Possibly your basal insulin isn't lasting the full 24 hours so your bg levels are slowly creeping up in the hours before waking.

Much like with levemir some lantus users find they have to split-dose to get a full 24 hour coverage from their basal insulin.

I'd concur with @noblehead. It seems likely that your basal is running out. TIme to break out the old basal testing: http://mysugr.com/basal-rate-testing/