That would probably work if you oven had a very low setting. (Some people might consider it not very eco-friendly though). And you would probably want to wrap the potato in foil to prevent it drying out - otherwise you'll end up with dried sweet potato in the morning.
A quicker alternative would be to microwave the sweet potato first, then oven for crispness.
Or, sticking a metal skewer through the sweet potato cuts down cooking time in the oven significantly, since heat is attracted to the middle of the potato as well as the outside.
A sweet potato
Yam
Yam.
no a sweet potato is a tubers
Sweet potato is a fibrous root because the potato itself is the root.
sweet potato
root
A sweet potato is a vegetable. Sweet potato's are considered to be a root vegetable because it grows underground. The sweet potato is pinkish orange in color.
Sweet potato reproduces by roots that can grow into new sweet potatoes. -Note that the reproduction methods of the sweet potato and potato are different.
Japanese sweet potato
The Kumara is the Maori sweet potato.
is sweet potato staple