Back to Hogwarts
When Harry had still lived in Surrey, he had gotten used to waking up at 6 with the loud banging of his uncle's fist on the cupboard door. Everyday, without fail, he woke up, regardless of how much sleep he got.
At Camp Half Blood, the Hecate children had shared the odd habit of waking when the sun rose with the Apollo children, although it was less because their godly parent was finally up at that time and more because every single child was attuned to their potions, whether they liked it or not, and if you let a potion on boil for too long it had the tendency to explode and coat the magical stones in viscous, orange liquid.
At Miss P's, it wasn't uncommon to be woken up at 5 in the morning by Enoch finding a new breakthrough in his abilities, or Millard, pulling a prank on his fellow peers.
And at Dauntless, most people were up by 5:30, with some waking up at 3 for training. Some of the more respected people could afford a 6:30am alarm, but it wasn't a regular thing to do.
This all accumulated into Harry waking up at five in the morning, with very little to do.
—
Professor Snape, in the meanwhile, ended up waking up at 6, immediately going to check on his newest ward, wrapping his cloak around him.
He knocked on the door and the lock clicked open. Surprised both in part due to the lock only being able to lock from the outside and the fact that Harry was already awake, he stared down at the boy.
He was still wearing the flame insignia jacket, but had replaced the shirt with an orange one that had faded patterns on it he could barely make out. He also wore a pair of blue muggle jeans, and had a knife strapped to the belt.