I'd like to add that you'll get more responses if you start a new thread on the forum next time you have a question.
Posting a question on someone's profile is likely to be overlooked ;)
Tresiba appears to last for 3 to 4 days. So I agree with @Antje77 that you will have to follow your numbers more closely than usual (more finger pricks). You may find that you have to use less fast-acting (if you do) for your meals, snack in between meals, and eat more carbohydrates in general, be mindful of exercise, and set an alarm overnight, to stop your numbers from dropping.
Comments on Profile Post by Abbey97