V.W.
Unless there is an emergency (Like your house is on fire)... NEVER EVER wake a sleeping baby. EVER!!!
Once I had to wake my son up early from his nap so we could make it to an appointment that I had forgotten about... He woke up a few times during each night for about a week after that (He normally sleeps all night long)... I swear he was doing it on purpose to get revenge on me. He can just wake up and zonk right back out. I on the other hand have to toss and turn for a little bit before I can fall back asleep.