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Turn off all of your devices. Work with the windows open. Avoid working in comfortable places. Maintain an upright posture. Acknowledge your limits.
Distance yourself from your cell phone, the TV, and other electronics. Don't surf the internet, either. If the internet is still too distracting, turn off the Wifi and don't turn it back on until you've finished your work.  Download an application that blocks distracting websites, such as SelfControl. You could set your cell phone to Airplane mode, rather than turning it completely off, so that any incoming messages will be blocked until switching it back into its normal mode. Cold air will help to keep you awake, while warm air will make it harder for you to stay awake. Think of the nights you can't sleep because of being cold compared to the nights when the cozy warmth of a room causes you to nod off. If you find the cold air is effective in keeping you awake, you can even go to the bathroom and splash your face with cold water. Not everyone improves their alertness in cold air. For some people, it works the other way around; Warm air causes them to stay awake and the cold makes them fall asleep. Choose whatever works best for you. Don't set up a workspace on your bed, on a couch, or on the floor. If you work in any other place than a cold, hard table and chair, you will feel very tempted to sleep and the more comfortable the location, the worse you'll feel.  If possible, work somewhere far away from your sleeping area or bed, so that it's an effort to try to go back and sleep. Try to be around people. Knowing that others may be watching you may motivate you from sleeping in your chair. Be careful of slumping! When you're tired, slumping your body becomes a natural habit. However, make yourself sit up straight. It increases your state of alertness and helps you to feel better.  Try sitting in different places around the room. Don't lay in bed with your eyes closed. You will fall asleep, falling into a crazed dream state in which you convince yourself that the work has been done already. If you can't remember what you've just read or you're nodding off involuntarily, you need to listen to your body and go to sleep. Sometimes it's better to get 3 or 4 hours of sleep. rather than be in a complete daze the next day.