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Do a simple movement, like tapping your feet and stretching. If it becomes a habit, it might just save you from falling asleep during those final dire moments and it can keep you awake without being distracting. Try keeping music on in the background. If it has a good beat, you may find yourself naturally tapping your foot to the tempo. Avoid a decreasing sense of energy and motivation by setting a constant pace for yourself: For example, try 40 to 55 minutes of work, and taking a 5 to 20 minute break, or perhaps a quick walk around outside in a safe and well lit area.  Looking repeatedly at a clock may distract you from your work. Taking breaks is especially important if you are working on the computer; it will help prevent headaches and eye strain. Take a short break to watch a part of a scary movie if you think it will help your productivity. Scary movies can keep one alert, but don't watch if it becomes a distraction; it's enough to watch a little during a 5- to 20-minute break.  Choose a movie with a subject that actually frightens you. It would be pointless to watch a movie about giant spiders if you like spiders. If you can't find a scary movie, consider watching a real-life documentary on a terrifying subject instead. Coffee or tea may seem like an ideal solution at the time, but you may get a temporary buzz then crash badly the following day (perhaps halfway through your test or meeting). Try staying hydrated with water instead.  Drink 2 glasses of ice-cold water every 30 minutes. Not only will the cold water help to keep you awake, but you'll need to urinate often, which will keep you alert. Non-caffeinated herbal tea will also naturally keep you awake due to tea's extensive amount of herbs. Keep in mind that some herbal teas, like chamomile, will put you to sleep. Avoid teas labeled as "bedtime" or "calming." Foods like sandwiches, cheese, and other dairy products can allow you to feel more alert. Sugary foods may make you feel awake for a little while, but will eventually make you crash and feel drowsy. Apples keep your blood sugar stable so you're able to stay awake longer. Any fruit or healthy food is better than eating sugary foods.  Avoid eating a heavy meal the evening of the all-nighter. This will leave you feeling lethargic and sleepy. Eat a light, healthy meal, such as a stir-fry. Avoid alcohol, as this depressant will make you sleepy. You may not enjoy it, but harsh and arrhythmic music will keep your mind alert. Try to stick to instrumental music, which is less distracting. This will keep you from being lulled to sleep. If others are sleeping around you, clearly you'll need to keep the level of the music low. Use earphones if necessary. There are acupressure points on your ears, and when stimulated, send electrical signals into your brain. After doing this, you'll feel buzzed and more awake. For example:  Placing pressure on the tip of your ear can relieve pressure in your back and shoulders. Pinching the upper-middle part of the ear can help to relieve pain in your joints.

Summary:
Keep moving. Take breaks. Watch a horror film. Avoid caffeine, if possible. Eat protein-rich foods to stay energized. Play hardcore metal music. Squeeze and massage your ears.