K.C.
Sounds like the discomfort from teething & the new standing up skill are combining to make this happen for your little guy. The crib must just "hit the spot" on his little gums. It's funny we are going through this at the same time. My husband has compiled a whole album of the many times we found our little girl sleeping with both legs sticking through the slats in her crib. She has stopped doing that now that she is 7 months old but she is still doing the standing-up thing. Because she is my third child I seem to be better at getting her to do what I want her to do. When I lay her down for her nap & she pretty much always pops up, hanging onto the rail, grinning at me or bouncing in the crib. I just turn from the door & say, "Lie down, baby girl!" walk out. I don't close the door all the way so I can see what she will do next. Sometimes, she actually does "obey" and lie down sucking her thumb. Lately, I have observed her standing there a little bit longer, sometimes crying for a couple of seconds, then putting herself down to babble to herself before drifting off to sleep. As others mentioned, sometimes (like today) I have come back into the room, given her a teething toy (She woke up with 3 new teeth today! Numbers 5,6 & 7!), then gently lay her back down saying, "Go to sleep, my baby girl," "Mommy loves you," or something like that. It works just fine as she eventually puts herself to sleep. If she cries for a minute or two that is okay too. I didn't want to train her that crying will bring me back to the room so sometimes I keep an eye on her discreetly just to make sure she's okay but I don't run back in if she cries.