Best for getting straight back to work.

Proven by scientists to improve pilot performance 34% and alertness by 54%. Best for a day you'll be working after-hours.

Causes "sleep inertia" (a sleep hangover) for up to 80 minutes before restorative benefits kick in. Best to avoid, if possible.

Helps cognitive memory processing, remembering places, faces, and facts. Best before a big presentation or important meeting.

Helps creativity, emotional memory, and procedural memory. Best before an impending project deadline or a big test.