Do Your Hobbies Prevent Sleep?

So I just spent a good 6-7 hours drawing a picture of Cinderella, it's freaking 3 am in the morning, I'm tired, but can't sleep. Hm... is it can't or won't?

In truth I'd like to sleep, but I've come up with a really great pose and design for my next art piece. Now, I only draw as a hobby, and as a past-time. But lately it's gotten to the point where I'll draw some sketchy picture instead of eating or sleeping. So it's no longer a past-time but what I do to survive. With this idea in my head, unless I draw it, I won't be able to be at peace. It's like when you need to urinate and you try to hold it in, it's not healthy.

This reminds me of when people play WoW and become so drawn into the game that they don't eat or sleep. Or when my brother decides to have an anime marathon and spends 20 hours straight watching anime [I must confess, I joined in]. At the end, my back hurt so much and my eyes felt like they were going to dry out. Healthwise I know it's bad, but the product just makes you feel like you've achieved something.

Does anyone else do this to themselves? Or is it just me?