Do a little research about human sleep.
People, when studied with video recording and brain activity monitors, do not sleep through the night. People wake up, scan their bodies and their environments and if there is nothing needed or nothing wrong, they fall back asleep with no awareness that they ever woke, and no memory of it happening.
So, your 14mo is waking up, scanning her body and finding out that she's hungry, or lonely, or scared, or too hot or cold or thirsty... and since she can't get out of bed and call a friend, mix herself a maragrita and close the window, she needs you to get you to help.
After having spoken to thousands of parents, I have concluded that the only people whose children 'sleep through the night' are liars, or THEY are sleeping through their children waking up and have no idea it's happening.
When she stops having needs in the night you need to help with, she'll stop waking you up.
at 11:53 AM on Aug. 11, 2010