being grumpy

I will be the first to admit that I have been acting in a rather silly manner these last few days. Saturday was the first day in ages that I actually felt reasonable, so what did I do? Make the most of having less pain by getting a good nights sleep? No, I stayed up all night until lunchtime on Sunday playing on the computer. I then had about 4 hours sleep, got up feeling exhausted and mooched around the house for a while. However come midnight I felt quite awake and ended up staying up until about 4am. Then had to get up about 4 hours later and do general Monday type things. So then yesterday evening I was knackered, but come midnight I was wide awake, became involved in a loooong debate on a forum I sometimes visit and finally crawled into bed at about 7 this morning. Slept until noon and then dragged my poor self out of bed so I could go to the supermarket as I had run out of food. I really have not helped myself out very much doing this, so now when all I want to do is go and lie down and get some sleep I can't because I have to go to the AGM for a charity I volunteer with.
Why do I do these things to myself? I must be some kind of masochist. I have vowed to go to bed by midnight tonight to get some much needed rest - which means no getting involved in all-night discussions with other British insomniacs and those pesky Americans who all come online just before I plan to go to bed and are all awake and lively and opinionated...
But at least you might understand why I am just a little bit grumpy today.
*signs off to go and pour coffee down throat*