L.U.
Well, I didn't read what everyone else wrote, but let me share a little something with you.
When my son was a newborn we were in a horrible car accident. We, unfortunately, got very injured and spent 2 months at children's hospital and I spent a couple of weeks at the hospital as well.
I didn't sleep well for almost a year. I didn't drive for a year. I was up all hours of the night checking my son, making sure he was breathing, just reassuring myself. I can understand that at 2 1/2 he also wants to reassure himself. I would almost say maybe bringing him back to your bed for a couple of weeks may help hiim to feel more safe.
Imagine how loud the accident was (especially if it totaled your car!) was there glass breaking? door crunching? people yelling (I am told that I screamed for almost an hour straight, I don't know, I remember nothing) Did airbags explode? Stranger ran to help you? All of these things are quite tramatic for such a little one.
It doesn't sound like limit testing to me, it sounds like he is feeling unsettled. Let him cuddle up to you for a couple of weeks, then transfer him back over.
L.