Got into office at 6.30am yesterday (hour later than usual) and was going back home by 8am. Ended up back in bed at 10am, woke again at 4pm. Back in bed at 8pm, slept through until 6am this morning. Wow! Really strange bug, high temperature and very weak (had to crawl up the stairs to bed FFS!) plus no appetite (one slice of toast all day) but feel fine today. Susie also had same thing yesterday, with the addition of vomiting throughout - so I think I got off lightly.
I am going to get over it by spending the morning in the office catching up on the work I coudln't do yesterday, then four hours in the chair this afternoon having both sides of my neck, and the bottom of the back of my head, tattooed this afternoon :)