My sweet step son does not like sleeping by himself right now and i dont understand why the sudden…

My sweet step son does not like sleeping by himself right now and i dont understand why the sudden change?! He came in our room 3 times last night till my husband gave up and let him stay in our bed. This bed is so not big enough for a preggo with twins, hubby, 2 dogs, and a toddler. Really hope the phase passes