what do you call it: dependable or work-a-holic?

in the 4 years that i have been working, i have never considered myself as a work-a-holic. all my life though, i have always thought i was dependable. ok, there may be times when i wasn't so dependable as a friend or a child... but that's another story. anyway, i always step up to the plate when i can. and when it is my idea to step up, it's just natural that i give more than 100% of my best effort. otherwise, for me, it's just embarrassing. since i got back here from my trip to Europe, my "usual" work hours became from 10am to 2am. that is, if i manage to come in around or before 10am in the office. most of the people i'm working with on my current project is based in Madrid and/or Oslo, thus i extend my work hours to confer and basically, work with them. but anyway, it's not like i spend 16 hours straight working. i usually break away for 2-3 hours during dinner time and then just come back. of course there are the occasional extra extra work hours; like when i worked until 6am the next day last Thursday night, and when i had to come in yesterday to work even if it's a holiday. but i am not complaining. truth is, working for extra hours is my choice. nobody really asks me to stay and work longer. it's just that i have this weird notion in my mind that i am needed. and these colleagues of mine are doing most of the testing for me (since i cannot really test most of the things from here). i just feel bad about asking them to test and then leave them. that is normal behavior right? anyway yeah, i'm a bit concerned if i am going over the top here. besides, my work attendance is suffering. i mean, when i don't work for extra hours, i'm already very bad at coming in on time. can you just imagine what's happening now? edit: i have therefore concluded that i have become... a work-a-holic. so next question is, how do you stop? :D