These are some rough tales, my guess is alot of us gamers suffer from similar social /seasonal depression/anxiety issues , final season for a student is a time full of stress, combined with being the end of the year means you have all the hell of christmas and perhaps tons of real life obligations , it all comes to a head and you want somewhere to escape. Videogames, internet , whatever, anything that involves none of whatever is making you stressed out.
There's also a slight fear or success going on, passing finals means harder school work next semester and finishing grad school means a great job typically combined with alot of stress, years of worrying about debt from student loans/mortgages and all that other fun stuff. You begin to think that just avoiding real life and not growing up is a better alternative.
So honestly it's perfectly understandable , these addictions.
For me , internet and gaming routinly keep me up upwards of 2-3 hours later then I should be, typically only on work nights because mentally I know as soon as I go to bed another day of work will only come faster and it'll be time slept + time at work before I'm home able to relax again.