I try to make myself disassociate a little bit. For me I might be extremely restless, but that doesn't mean I have the physical focus and calm (well of course not) to be very productive, and if I try to give into the stimulation, such as by exercising, it just winds me up ever more and then I want to destroy everything.

Most of the time I will pace around outside, smoking cigarettes and talking to myself, trying to get my mind to focus in on something.

Or I might try a mildly stimulating but mostly-mindless activity. I go to that pogo.com website and play bejeweled for hours sometimes at night while listening to music, just trying to 'zone' into it and leave the physical world behind. I'm a fairly simple creature at my core, only my surface layers are super complicated, so the colors and sparkles and making things explode actually entertains that primitive core part of me.