Happens to me all the time. I've been collecting and analysing data and have actually quite enjoyed it because it's just forms and button clicking. In my view, the really high end stuff is the actual writing. I've been putting it off with the excuse that I have to, erm, collect my data at all costs and then analyse it. However, I've nearly done this now and I have no excuses, barring death, to actually put it off any longer. I read through what I've done so far and feel as though I don't understand it any more. So, it looks like I'll have to get into the writing frame of mind again. For me, it's the skill I'm weakest at.