Interrupted Sleep Cycle

It's almost 4 A.M. and I seem to have badly interrupted my sleep cycle.  I took a much needed nap yesterday from around 5 P.M. to around 7 P.M. and I've been up ever since.  I tackled a work related report and finished it close to 3 A.M.  I feel almost wide awake, although there are some sleep cycle physical sensations, probably related to the circadian cycle. Fortunately, it's now Friday, so the weekend is just around the corner to hopefully get myself back on a regular sleep cycle.