Hi everyone! We are traveling to see some family this weekend and I have a question about sleeping in Pack N Plays. We used the upper part of the Pack N Play (the mesh part that zips and holds the mattress about 12" from the top) when she was really young. Now that she is 8 months I am worried that it is too close to the top and she would be able to crawl out. Is it safe for her to sleep in the very bottom of the Pack N Play or is that only used as a "play area"?