What happens to your sugar levels overnight? Do you drop? Try to contain your worries to things that actually happen, and not to what might happen. I would take a night or two and do some night time testing to see what happens overnight. It's a pain and the alarm gets annoying, but this way you will see what happens and know whether or not to be worried.
As for complications, it's a funny thing. Some folks don't take good care of themselves and never get any. Most people who take good care of themselves don't get any, but there are a few who have good numbers and still get some. You never know for sure, but you change the odds tremendously (by about 97% in the case of neuropathy) if you have good glucose control.