Most daytraders in on the volatility will want to clear out any remaining part of their position early tomorrow. These individuals usually know next to nothing  about the stock(s) they are trading in... . Been told by reformed past daytraders that it makes for better weekends, when news can wreck even the best of positions. Thus, the smarter (not that any are truely very smart for very long) ones get out on Thursday or early Friday.  Anyhow, most of them lose over the longer term.

Old Joe