Well that all depends. Some people are heavier wetters, others sleep deeper and longer.
Some diapers can handle side wetting, I know my CVS fitted briefs can handle one if I don't flood. Which reminds me I gotta do a write up about those sometime.... My suggestion is to experiment, and check your diapers. Some of them might got good leg guards, or even some side padding built into them.
I just hope you're a light wetter.