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Perk yourself up by listening to music. Music triggers emotional responses in humans, helping us engage many parts of the brain.  Listen to music that's energizing to you. If possible, dance or sing along, even if you just bob your head or hum. Music that's irritating or jarring may keep you awake better than music that's familiar. Just do your co-workers a favor and remember to use headphones! Listen quietly instead of loudly. It's a common misconception that blasting music loud will help keep you awake. Actually, turning the music down to a very low level is more effective. It forces you to try to listen closely in order to hear the instruments, lyrics, and percussion. If you're having difficulty discerning the lyrics, then the volume is just right, because this means your mind's working. Getting interested can work as a distraction. If you are interested in something, your brain is focusing.You can get interested in your work or something that is happening in your surroundings. Preferably, natural daylight. Your body's internal clock (its circadian rhythms) are regulated by your exposure to sunlight. This means you can trick your body into believing it should be awake even when it feels tired.  Step outside, even just for a bit. If you can step outside (even on a cloudy day) or look out the window for a full minute, you'll be more alert. Work the artificial lights. Even if you're in an environment where there's artificial light, brighter is better. Wherever you work, see if you can replace the light fixture or add a lamp that will brighten your workspace. If you chew ice, it's almost impossible to fall asleep.  The chilling temperature keeps the brain on its toes, even while you are driving late at night, exhausted, and what you really want to do is fall asleep. Chewing anything, even if it's just your pen or pencil, causes your body to think you are about to eat. Your body will prepare for food intake by releasing insulin, which will make you more alert. If it's a little cold, take off your sweater or jacket so you stay on the chilly side. Open a window or put on a small fan, pointed at your face.  The reason your body responds the way it does to cold is that it's prepping itself to work to keep you warm. Your body needs to regulate your internal temperature to keep all of its organs functioning. So if it detects ice or extreme cold, it will work to keep itself awake longer. A pungent scent — good or bad — can make you more alert very quickly. Aromatherapists often recommend essential oils of the following plants to stimulate the nervous system and reduce fatigue. Open the bottle and take a big whiff of the following when you're feeling drowsy:  Eucalyptus blue gum Peppermint Coffee; beans or brewed, both work: a study has shown that simply smelling coffee can awaken a person.  Of course, not all of us have essential oils stored in our file cabinets. Using hand lotions or burning candles with these same scents could help. Herbs like rosemary and peppermint can often be found fresh or dried at a grocery store; for a little pick-me-up, take a pinch and roll it between your fingertips and smell it. Eating can help you stay awake, as long as you avoid a full stomach. As most of us know, eating to excess often makes us sleepy, so don't eat a full pizza or that 12 oz. steak during lunch.   Munch on snacks all day rather than having a big meal. The key is to not get a spike of sugar intake (followed by the inevitable crash). Predictably, the same goes for caffeine: break your coffee, soda, or energy drink consumption down into small doses. Avoid breakfast that are high in carbs (muffins, toast, pastries, bagels, etc.). You're giving your body a reason to crash at about 11 AM because it gets a sugar spike early on. Put a small handful of sunflower seeds in your cheek and crack them open one at a time, using only your teeth and tongue; this will require just enough active thought and tongue movement to prevent you from dozing off, and the salt of the sunflower seeds is invigorating and stimulating; spit out the sunflower husks into a paper cup as you go, as quietly as possible so as to not disturb others around you. The internet is full of interesting websites where you can choose from a variety of games to play online. Pick a word game, or a puzzle, a car racing game or anything that suits your liking. Spending just about 15-20 minutes playing a game will awaken your mind because it is not taxing or boring in any way. It's more fun if you pick a game you're good at.
Listen to music. Get interested! Expose yourself to bright light. Chew ice. Splash cold water on your face. Use your sense of smell. Eat healthy. Play a game.