Apparently I dont work well without pressure

Instead of getting a lot done on my presentation (on membrane potential and depression in rats) I exercised, tok a nap, hung out with Sophie and James and wasted time. I did read the article but I didn't make much progress - I am supposed to meet with my professor tomorrow (I gave myself this false deadline so I would be finsihed in advance) but apparently 4 pm tomorrow is not close enough to inspire me to really get working. I have my textbook at my apt and I plan on reading it tonight but first I have to get home. I am currently waiting for Erin so that I can drive her back to school on my way home. Stopping for coffee will probably be neccesary. I also have to get a decent night's sleep as I have a 3 hour neuro-anatomy lecture at 9 am.
I'm not sure why I didn't get anything done today. I'm not sure if it is basic procrastination or anxiety about actually doing the presentation and my concern if I can do it well.