Toddler Sleeping on the Floor

So my 1.5 year old daughter has a toddler bed and naps fine in it, but at night my husband and I find her on the floor multiple times... we even put a pillow down on the floor for her but she usually just lays straight on the floor with her lovies. We can never catch her doing it and we don’t hear her playing with toys so we aren’t sure why she does it! We have tried taking her comforter off as well to see if she is getting too hot but it still happens. Not that I’m angry about it, but it seems alittle strange 🤷🏽‍♀️ could it be separation issues or just a toddler stage? Not sure if anyone else has toddlers who do this!