Suspicious night noises

I woke up in the middle of the night last night, not to Owen, but to the sound of whispers and little feet in the hall way.  I sleep on the side of the bed that looks directly down the hallway (since I sleep much lighter than Jared) so that way I can just sit up and see right down the hall.  Just for reasons like this.  After my eyes adjusted I could see Katie and Ethan hunched over and tip-toeing down the hall with their pillows and whispering to each other.  I looked at my watch.  4 am.  Weird.  Usually Katie and Ethan sleep like rocks until 7 am.  I can go in their rooms and check on them in the middle of the night, put clothes away, move their blankets around and they usually don't even stir- until 7 am.  So really strange that they're up at 4.  And even more strange that they're carrying their pillows away from their bedrooms.   I laid there and thought before acting.  I knew they had built a fort out of pillows yesterday afternoon.  And there had been some talk about how fun it would be to sleep in it.  Wouldn't it be cute if they were headed down there to cuddle up and fall asleep together??  That would be precious.  But was that a chance I was willing to take?  What if they went down there and ended up wrestling and waking up all the way and then wouldn't go back to sleep at all and then I had to get up and stay up with them just to keep them quiet so the rest of the house could sleep?  Not a chance I was willing to take.  So I tip-toeed down the hall after them to walk out to the living room and find them piling their blankets and pillows on the couch to have a sleep over.  It looked like they'd been at it for a while.  I must not have been sleeping so lightly after all.  Katelyn insisted that Ethan had wanted her to go wake him up.  And he did look like a very excited accomplice.  None-the-less, I shewed them off to their beds.  Katie also insisted that she simply wasn't tired anymore- which is pretty unlike her.  She needs her sleep.  But I didn't want to argue about it anymore, so I let her read books with her light on and door closed as long as she stayed quiet.  About 10 minutes later she got up and turned her light off and went back to bed- where she stayed until 8:30- just to make up for lost time.  Ethan slept late too.  Those sleepovers can be a beast.