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How to stop spending all night on the computer
Determine in advance how much time you want to spend on the internet.
Set a timer if the time you will be on is shorter than an hour or so (most timers have a maximum of 1 1/2 to 2 hours).
This works well if you have errands to run or chores to do around the house.
Set an alarm clock if you need to be off at a specific time. For example, if supper has to be made at 5:00 and it is 2:30, set the alarm.