"I wonder what happens if I pour water onto this pile of soil ... quick!... more water!!"
"Not quick enough! I need loads of water..."
"Hmmm... it doesn't work..."
These are known as pyjama experiments (or stalling if you prefer). Only Faith knows what she was doing, what the water was for and what it was that didn't work. Curiosity satisfied, she was very happy to curl up next to me for a bedtime story - no explanations necessary.