Last night, however, I just slept. Stretched out on the couch with the cat on me and dozed the night away. I'm still tired, it being my regular time for sleeping now so I'll be doing more sleeping today. Looks like a cold, wet, cloudy day, which should be good for it.
Could be the changing weather, but I think the work routine of Friday and Monday which had me hopping to three different shared workstations also contributed.