This can be explained by Source Monitoring Error. This is a memory error and occurs when we attribute a memory to a wrong source or situation. In this case, the memory of what is dreamed is mistakenly attributed to a situation actually experienced. This memory error is very common and it often happens from childhood memories.
A bill goes to a conference committee when both the House of Representatives (HoR) and the Senate have passed a different version of such bill.
The conference committee is the one that ensures that there is no difference on the bills.