Why wake up to a jarring beep when you can rise to the scent of peppermint — or crisp dollar bills? Guillaume Rolland, 17, of Nantes, France, hatched his idea after learning that hearing-impaired patients at a nursing home where his father works needed nurses to wake them each day. He built an alarm clock equipped with a small filter onto which users can drip a variety of scents. He has worked with perfumers to synthesize the smell of coffee, freshly baked bread, chocolate, and, yes, American dollars. When it’s time for the alarm to go off, a small fan at the back of the clock spins, and a tiny door at the top of the clock opens so the fan can blow air through the filter and disseminate it near the sleeper. In pilot tests on nursing home patients, teenagers and adults, Rolland says the menthol scent woke people within 2 minutes 100 percent of the time.