lack of sleep
Most people don't know that sleep deprivation has antidepressant effects. This is a scientific fact, and I have confirmed it through personal tests.
For the last two Fridays my friend and I have met up around 10 p.m. and binged on energy drinks while playing computer games.
When we hit the 20-hours-awake mark is when the fun starts, because "the stupids" set in.
Now, "the stupids" might not be a scientific term but let me assure you it exists. There is a point when you're so tired you don't feel like you need to sleep. You also start giggling because everything seems obscenely funny.
Add alcohol into that mix: you're over-tired, giggling and drunk. Suddenly it seems OK to blast techno music at 7 a.m. as I lay on the floor making dinosaur noises.
Do it. It is fun.
Just remember that you will be burned out for at least one day afterwards.