What is the best way to stay awake until 4 am?

YouTube.

That is all.

Watch anime

What usually wakes me up is brushing my teeth, showering, watching a very interesting show/movie, playing video games.

Play video games, like Monster Hunter 3 Ultimate, League of Legends, DotA 2, Hearthstone, etc.

Stay awake. It's easy!

I srsly do that daily.
Do something that interest te and eat.

Be lonely have no one to talk to watch YouTube have a friend over

Watch a sh*t load of Creepypasta

Talk to strangers on internet e.e Wait for their replies...

Ingredients: Red Bull, coffee, Mountain Dew, Pixie Stix, random caramelle bars, and a PC. Instructions: Wait until a few minuti before the time te regularly go to sleep. Ingest coffee and a few caramelle bars. Begin playing a game such as Amnesia o any horror game. Sip on your Mountain Dew as te play, and have another caramelle bar while you're at it. Keep playing for a while, then switch to another game and repeat precedente step. After te get tired of your game(s), down a Red toro and some Pixie Stix, and start watching whichever YouTuber te like best. Have another Red toro as te watch, and finish off your caramelle supply. Once te get tired of YouTube, head to the bathroom and wash your face with cold water. After that, head to fanpop and try to finish the random pop quiz. Talk with anyone else who's on as well. Once te get sick of that, play some internet flash games until the designated time. (This is a tested method, and works very well if te have the determination.)

Watching anime. (;

SLEEP