It snuck up on me, but WHAM! I suddenly had to sleep, but it wasn't a full sleep; more of an "I'm conscious, but my body won't do anything and I need to wait this out" sleep.
As I started coming out of it I fumbled for food by the bed. Darn. Warren keeps clearing it away because he thinks it's disgusting to have food by the bed (hey, I do keep it sealed!). I finally find a package of dietetic cookies I'd hidden under my bedstand precisely for this reason. I ate four; they tasted ucky, but after about 15 or 20 minutes I'm functional again.