Hi Ginger. I haven't found that I've been doing this too much.
Which doses are you particularly worried about having changed? If it is your dinner dose of Novo, then why not try to have dinner earlier. I usually eat late (about 8pm or later) but that means I still have Novorapid in my system when I go to sleep which is not great if the result is unpredictable. But if you were to eat at 6pm and go to bed at 10 or a bit later, you would know that all of the Novo is done and dusted and shouldn't cause you to dip, nor would your food cause you to rise really after that time (unless you've had a really fatty meal).
My other tip if you are worrying about lows is to not eat too many carbs with dinner so that you are able to give yourself a more modest dose of Novo than if you eat tons of pasta where you will need a lot. That should help keep you steady and avoid any sudden dips from a whacking great dose (and should avoid highs caused by not having enough).
Levemir really should only take 2 nights to settle once you have adjusted the dose, and that is a maximum. So, if you have adjusted your dose either way you might want to do a 2am test for 2 nights to check all is well, but after that you should be able to relax more.
I know it is hard not to worry about what is going on during the night, but you do need to rest as well. Tiredness is a real culprit in unpredictable levels for me.
If you makes you feel better, I've had a couple of terrible nights. Last night I had a mild hypo before bed (3.8), had a glass of milk to treat it, and then woke up this morning at 11.2 
. I'm pretty sure I didn't dip down after the hypo, so perhaps I just overtreated. Very annoying. I've now had no food and 8 units of Novo and am still at 9.X. Sometimes it is just a bvgger!