Actually, that's only one of my excuses for not writing recently. Another part of it is mild depression. I tend to sleep longer in winter, and for some reason I also tend to finish writing novels in winter. I've just stuck 1400 pages of manuscript in the post to my agent and, not to put too fine a point on it, I feel exhausted. One redrafted novel (118,000 words) and one wholly new novel (185,000 words) is enough. At least for one winter.
(The day trips to Amsterdam, Brussels, and Leeds didn't help either. Talk about alternate realities
Meanwhile, cheer up: if you haven't met him already, here's Argon Zark.