Some studios have a pull down Murphy bed so can sleep 5.
I think the resorts are: Boardwalk, Boulder Ridge at WL, Poly, GF and Beach Club.
Some of the 1 bedrooms sleep 5, others only 4. The confusion comes with the fact that DVC owners can put 5 into some 1 beds but they will not provide beds or bedding, and will not allow non-owners to book these villas for 5. (As renters you would also be able to sleep 5 in them but have to provide bed and bedding). Mainly this was to allay the criticism that the studios can sleep 5 but not the 1-bed villas. N
So officially, the following 1-bed villas sleep 5:
AKL Jambo (NOT value)
These can sleep 5 if you own or are renting from an owner:
Boulder Eidge at WL
Unsure on Copper Creek at WL