““First, larks don't just like to get up early; they also get tired much earlier in the day than owls, and they can't handle sleep deprivation -- it disrupts their concentration much more than it would for a owl. On the other hand, although owls hate to get up early, and often can't really function in the morning, they handle sleep deprivation very well and can get on with things just fine even when they are deprived (up to a limit, of course).””
