That's all very reasonable, but to someone who normally neither needs nor wants to sleep (not to mention is the dictionary definition of bull-headed when he wants to be), all he hears is "but sleeping wouldn't help either". Also Sebastian has exactly one friend in the whole world, and she's probably asleep right now anyway.
"I could not say for certain where this particular situation is concered, since this is my first time experiencing it." He rubs at his temple with a hand. It's his usual 'I'm very done with this' gesture, although now it probably only adds to how tired he seems.
"There is some variation in length of duration, typically - some things will last no more than a day, others up to a month. Most common I would say is between one and two weeks."
So either it's almost over orrrr they're in for one more week. Joy.