Well, if I'm, say, in my room, gaps in my schedule just get filled up with something random. Like reading or drawing or aimlessly surfing the web to fill up the time until my next whatever. But if it's a matter of having time to kill and no books or paper or internets or space to do cartwheels then . . . *shrug* I think my default timekiller is either websurfing or yoga, if I'm feeling like being healthy.

Boredom is a universal problem, I'd say, but speaking as a non-autistic person, my mode of thought is usually "Huh, well there is time opened up here. What do I feel like doing? Reading? Yoga? Drawing? TV? Stare at the computer like a zombie?" and if the answer is "none of the above," then I repeat the process.