I watch "Family Guy" (and I'm embarrassed to admit that) every night when I go to bed and amazingly, no matter what time I go to bed, it's on. Pretty much any time between 7:00ish and 2:00ish, it's on one of many channels.
If by some freak occurrence it isn't on, I take that as a sign that it isn't bed time and try to stay awake until it is on (almost always within half an hour).
If it's ever canceled, my sleep cycle will be all kinds of messed up.