NOTE: This is not about what sport you find most boring, more which ones were blatantly created for snoozing at.
I always associate these next two weekends for drifting off to the snooker. The noise (and lack of) in the room is always great for dozing off to then being woken up abruptly by when Higgins pulls a century out of the bag.
2. Formula 1
3. Cricket (in real life or listening to TMS)