Such light sleep, unlike deeper stages of sleep, may do little to enhance mental alertness after the napper awakens, Dr. Dinges said.

Research shows it can enhance alertness, and plain coffee has almost no calories.

They enhance alertness in the short term.

The Athletics program cultivates lifelong habits for good health, enhances mental alertness and emotional stability, and encourages students to excel to the best of their ability.

But what about drugs to enhance memory or alertness, to be taken before a test - isn't this akin to an athlete unethically taking steroids before a race?

For example, certain combinations of frequencies appeared to enhance alertness; others to induce sleep; and still others to evoke expanded states of consciousness.

The buzzer will also activate a steering wheel that emits an aroma that enhances alertness.

For kids, breakfast appears to enhance alertness, attention, and performance on standardized achievement tests, reports the ADA.

Ampakines are a class of compounds known to enhance attention span and alertness, and facilitate learning and memory.

The aroma of peppermint has been found to enhance memory and alertness, although other research contests this.