"I don't know, sleep." Sam said as he took the jacket from Giac and shrugged it on. It felt weird to wear another guys coat but it also felt weird to wear shorts outside in winter. He sniffed a little and then considered what he had planned. "Study then sleep. I'm utterly knackered."

Barty probably knew about that because Sam slept very poorly last night. It happened sometimes, he was a restless sort of sleeper.