People wake up early for lots of reasons and people need to burp for lots of reasons. Try not to get all worked up or you'll convince yourself you're feeling things that you probably aren't. Just because you woke early needing to burp the last time it happened, doesn't mean it will again, in fact the chances are very very very small grab your favourite book or a decent magazine or stick a dvd on your laptop and I bet you'll be back asleep in no time!