How much less energy does a computer use on sleep?

Why doesn't my computer have sound after I wake it from sleep mode?

I put my computer to sleep so it won't use as much energy as it does when it's up and running all the time, but sometimes I wake it from sleep mode and I no longer have sound. The only thing that brings the sound back is completely restarting the computer, and I wanted to know if anyone knew of a way to remedy this so I didn't have to restart it every time it happens.
Answer:

I have seen updates for some computer models to correct problems with some devices not responding when the computer wakes from sleep. What is the manufacturer and model number of the computer and the operating system and is it 32 or 64 bit?

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