If you want to disable Sleep Mode on Your Laptop because you have problems with the network or for any other reason just follow these easy steps:
1) Go Start > ControlPanel > Power Options



2 ) Make sure to select Portable/Laptop from the dropdown menu

3 ) on Plugged in Select Never on all options............................
      
           4) on Running on Batteries is up to you how long you want the Laptop be  awake, but, obviously the longer you want it on the shorter your battery will last.

5) Click OK and you have done it

If your computer is a Desktop the only difference is that you have to select Desktop on the drop down menu.

On the Advanced Tab you can set different options like
Ask for Password when resumes from StandBy
I suggest to keep it on



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