Liz and I have this "problem." We'll sit down on the couch, one or both of the boys will come over and sit next to or on us, and we'll drift off to sleep for a long time. Liz refers to this effect as the "purr ray." I refer to it as a purr drug, because the feeling is so addictive and it knocks you out like a strong drink.
On weekends and nights when I know I have time, I'll go over to the couch and wait for Arthur or Beowulf to come. The downside is, after they arrive, hours will disappear. Liz got these compromising pictures of me strung out on purr.