Why??

I have a 5 year old that still sleeps in me and my husband's but I was a single mom 4 4 years so my younger son slept in my bed when I got with my husband I tried to transition him into his bed and I had the patience to do it and he would put up a fight until an hour before I had to actually go to work so I lost a lot of sleep I got a crib for a hobby that I do and my husband had put him in it and he slept through the night usually my son wakes up through the night like at least five or six times just tossing and turning and whining even though he's still in my bed and my sense never been in a crib he want from a bassinet to my bed to his bed his bed is a toddler bed why do you guys think this kind of works in a way but it is kind of weird cuz he's five but my 5 year old is the size of a two year old