Well, F. We knew she had unusual upper body strength (she sure as sh*t didn't get it from her Momma!). We knew we had to put her back in sleep sacks after her first birthday when I had to catch her crawling out of the crib (sleep sacks so she couldn't get a grip on the side bars). I'll be damned if we weren't taking the tree down today, and my sweet girl--that was supposed to be in her crib asleep--walked into the living room. I guess she crawled down, opened her bedroom door, and opened the living room door. I immediately freaked out (as any first time mom is likely to do...). We have dismantled the crib and effectively locked in her in her room tonight. I am losing it over the fact she could've been hurt. Glad she was not and it was NBD, but sheesh!! Time to buy a big girl bed tomorrow. Sob!!!

Was not ready...
Re: Crib-hopping at 16 months...
"I will show you the kind of big sister I will be..."
OP, I'm sorry. I'm not looking forward to the day, but I know it's not all that far for us, either. He's a monkey.
As for sleep walking S1 is my sleep walker/talker. Last night I had a 5 min conversation while feeding S4 and she was dead asleep. She often wanders around her room. DH does this too, I sleep closest to the bedroom door so he wakes me when he walks. I've stopped him from leaving the house once or twice.
BFP #2 11/30/09 EDD 08/12/10- Sophia Grace born 8/1/10
BFP #3 11/16/10 EDD 08/04/11- Samuel Richard born 7/28/11
BFP #4 01/04/12 EDD 09/19/12- Simon Nathaniel born 9/6/12
BFP #5 03/27/13 EDD 11/25/13- Savannah Lee born 11/18/13
Not sure if the shortness will help us when she starts trying to climb out of the crib though. OP, good luck with the transition to toddler bed or mattress! We'll likely try to transition DD1 in 4 or 5 months, to get DD2 out of the pnp and out of our room, but I'm not looking forward to it.