Sora went to sleep in order to recover the memories he lost in Castle Oblivion. It would take quite some time to bring back all the memories he had created in his lifetime.
But Organization XIII held sway over Castle Oblivion.
Sora would need to be kept someplace more secure.
I persuaded Namine to move the slumbering Sora to Twilight Town for safekeeping.
Namine.
As I have written here before, she is a most unusual being.
Born of the same process as a Nobody, but lacking virtually all the elements of a Nobody.
Perhaps she continues drawing in hopes of capturing tht which she lacks: the memories of others, especially Sora.
I have arrived at a hypothesis.
I believe that Namine was born as a special type of Nobody when Sora attached himself with the Keyblade, causing his and Kairi's hearts to leave their bodies simultaneously.
Namine emerged as Kairi's Nobody... but the body and soul necessary to exist as a Nobody belonged to Sora.
When a person's heart is stolen, a Heartless is born with no sense of self, and the body and soul left behind give rise to a Nobody.
But what if one willingly releases one's heart from one's body?
Sora and Xehanort retained their selfhood even after becoming heartless.
Then there are Kairi and Namine.
Kairi was exceptional for having no darkness within her heart. Also exceptional was that her heart, once freed, migrated to a new vassel - Sora.
The combination of these two theoretically unlikely expections may be behind this anormaly.
There are matters I must attend to while Sora is sleeping.