The sentences from "Early to Bed, Early to Rise" that contain claims are:
- "Some research even suggests we may age faster because of missed sleep!"
- "Second, we will not be able to think clearly if we do not get enough sleep."
- "First, our health will suffer from a lack of sleep."
These sentences assert statements about the effects of sleep on health, aging, and mental clarity, which qualify as claims.
The sentence "To get this much sleep, seventh graders will certainly need to adjust their schedules" presents a recommendation rather than a claim about an effect or outcome.