Pack n Play

My baby and I are moving in with my sister for about 4 months while my husband is away at military training. We’re not bringing our crib with us and will just use a pack n play for that period of time.

How do your LOs sleep in a pack n play? Does anyone use it for regular night time sleep instead of a crib or bassinet? If so, do you use the mattress that came with the pack in play or did you buy your own?