Your first two definitions are complex partial seizures.

Or could be, sorry for being so direct. My son has these and they
are exactly what you describe. He can carry a complete conversation,
but not know what we descussed later. Or he can walk and walk and
talk to us. But not have a clue later. He walks like he knows where he
is. But has no clue how he got there.

Now he has the slurred speech, and the falling asleep, and then
just waking back up say 15 to 30 minutes later. Too.

That can be either a simple if there is nothing else, but if there is
more, then its a complex too.

Donna