Insomnia?

I'm not sure if this is an issue, but is it insomnia if I actually sleep quite well, it's just my inability to go to sleep? I find myself working here in the lab and it's almost 3am, I have to
get up in about 5.5 hours, and I only slept about 4 hours last night? I feel tired, but I find myself slightly strung out, not able to just drop things and leave? Am I allowed to leave? I've got more to do before I sleep but I think instead I should just sleep.

I want to play Mario Super Strikers though, or perhaps God of War, both of which have been preoccupying my random spare moments of late. Both incredibly addictive games for completely different reasons. But files are finished transferring now, so I best do some work and sleep while I can. I'll talk more about my respective experiences with those games in bit.