I need my sleep!!!

Recently I have been so hungry for sleep.
I know that I can go without food a long time, but without sleep - c'est impossible! Maybe this is because I am too sensitive to the world and I get too many impressions, so my poor little brain has to have enough time to process all the info that it is consuming during the day:)And, besides - I am quite illogical, unable to make a very structured picture of the world around me...so it really takes time.
Strangely, I sleep around 7-8 hours, which before proved to be enough...but now. Maybe because it is a new job, I am trying to get used to new patterns, new habits.
The pressure is often quite high, and, as a new member of the team I do not know how to react.
Besides, I didn't have a free day for two weeks now - to do the stuff I like doing in my free time. I have been attending a Reuters course on Financial markets and company reporting. It is rather interesting indeed, yet the hall where we are staying has no natural light and air and some luminiscent lamps...that make me really sleepy. You can imagine, adding to that that I stayed till 2 a.m. (again!) at the office and will be attending two parties tonight and tomorrow, how productive I am - constantly fighting with my eyelids:)Yet another thing is really strange - as if my brain just switches off when I am not working, as a reaction to protect itself from overheating. And I am feeling in a kind of a delirium:)