Dean soon discovered that Castiel was not a morning person. If they were going hunting that morning, the guy would stay in bed until the very last moment. If Dean said to be ready and out at the Impala by eight at the latest, Cas would get out of bed at seven fifty-eight. Yeah.
And really, it wasn't a problem, because every human had their quirks and now Castiel was no different. Not to mention, when he had literally just rolled out of bed and thrown on some of Dean's clothes, with his hair sticking up on all sorts of angles, Dean had to admit, he looked kinda adorable.
He was pretty sure he'd have to kill a puppy or something just to feel manly again after thinking that.
Dean did the regular morning doorknock routine they'd gotten in to. Cas needed routine to start with, so he could get the hang of the whole human thing, and apparently, Sam had been only too happy to oblige. So that meant, every morning at eight thirty (unless they had a hunt) he was the wake up call.
First Sam. Which was fine. He never had any problems waking Sam up, not since he was a kid, anyway. He knocked on Sam's door and yelled, "Rise and shine, Sammy!" And a few minutes later, he'd hear the shower turn on. Like clockwork.
But then it was time to get Cas up.
Cas was last on this call for a damn good reason. He was a complete pain in the ass to wake up. It took Dean a good ten minutes every morning just to convince him to get out of bed.
Cas in the mornings was the bratty teenager that ever parent hated dealing with, and Dean was starting to wonder if he was ever really that bad. The steps to waking Cas up went something like this:
Step one: Knock on his door and yell, just like with Sam. However, Dean now knows that Cas just pulls a pillow over his head in order to better ignore him. Ass.
Step two: Bribery. It always used to work with Sam. Mention bacon and eggs and Sam would be out of bed like a bat out of hell. Or a demon out of hell. But not Cas. Cas stayed firmly put under the blankets.
Step three: Enter. "Castiel," Dean sung. "If you don't get out of bed right now, I'm going to kill you." At least that gets a grunt. That's the start, it means Cas is waking up. Sometimes, if Dean's especially lucky, he will get a reply like 'what are you doing in my bedroom?' or 'not if I kill you first.'
Step four: Stealing the blankets. It worked well, except for the one time Dean did it and Cas had been sleeping naked. But he didn't do that anymore, so there were no surprises. This step usually gets a moan and a rude finger gesture that Dean definitely didn't remember teaching him.
Now, one would think that would be enough to get a person up, but no, the former angel just buried his face further into his pillow.
Step five: The one that Sam didn't know about. Dean and Cas had taken to sleeping in the same bed. It wasn't sexual, it was just a way to keep both of their nightmares away, and it worked. They provided a comfort for each other. But one of Dean's last resorts was always to threaten to leave Cas to sleep alone.
There was one time that didn't work, and there was a water gun and a lot of yelling, cursing and Enochian, and possibly some other languages. Because when Cas gets especially pissed off and tired, he switches between languages without even realizing he's doing it. But it was best to not go into that.
If he was honest, he felt bad about threatening to leave Cas to sleep alone, but it worked, so what was he supposed to do? This usually results in Castiel sighed and slowly getting up, glaring at him, and muttering in Enochian until Dean leaves.
About ten minutes later, Cas will come down to breakfast, showered and dressed, bare foot, with his hair still wet and sticking up strangely, and request that Dean make him the bacon and eggs he was promised.