You know you're addicted to KSP when...

[cwhiz]

When you can relate to 80% of this thread.

[Dooz]

When you remember the phase angles

[Tex]

When little green men start flying around in your dreams, urging you to go and land on the Mun to do some science when you really, really need some sleep.

[Floppster]

When little green men start flying around in your dreams, urging you to go and land on the Mun to do some science when you really, really need some sleep.

When you're past the point of sleeping. Jeb doesn't need sleep, why should I?

[Lundmunchkins]

When you can't focus on a test because the picture of a rocket on it's design should have low TWR and Delta V

[Tangle]

When you're in physics class and they're talking about thrust and they say an example and you think, "I could do better."

[Wabbit]

When you check your phone while sending things to see if you have Remote tech connection to KSC.

[General Rarity]

when you try to time accelerate your TOG II* in World of Tanks, oh the frustration.

[Helix935]

when you end up giving the lessen in class on the space age instead of the teacher