There is someone already in the bed when she attempts to climb into it Her voice, plus the movement of the mattress, is enough to wake him from his story-induced slumber.

Hiccup blinks blearily up at Seras. Upon seeing a person he doesn't recognize getting into bed with him, he jumps back with a "BWAUGH!" and rolls off the bed, landing with a painful sounding thud.

"I'm okay," he mutters from the tangle of blankets that fell with him.