On OS X, there's an app on the store called Caffeine. It keeps your laptop awake when the lid is down. You won't blow any of your gear if your computer goes to sleep, but you may have some glitches when it wakes. It's unlikely to happen, but a possibility. NI recommend you run Traktor (especially Scratch) from a fresh reboot. That said, I've run Traktor without issue from sleep many times.
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