Forgot to inject night time levemir... what should I do?

Well, we're not supposed to advise on dosage here, but in your position I'd probably wait the 12 hours till my next levemir injection was due. You could probably sneak it in a couple of hours early. But then you'll have to keep injecting extra novorapid to compensate for the missing levemir..... I'm guessing your aviva expert won't tell you the right amount because it assumes you've got basal on board, and you don't.

Keep testing, and remember to be careful about hypos from stacking insulin.

Alternatively, inject your levemir now, and have that as your new daily time of basal injection, move it 2 hours forward each day.

Do you have someone you can phone at your diabetes clinic to advise on this?

Good luck.