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In all the physiology courses I've taken (there have been to many..) I've never heard of muscle loss at night. I suppose if you maybe slept like 15 hours a night then it's possible, but not likely. Your body relies heavily on sugar stored in the liver at night for energy, since it doesn't need much seeing as to how you are pretty immobile. Just be sure to get enough protein in your day, and after your workout I think is also helpful. From what I know, most of what you eat right before bedtime, no matter what it is, is going to end up getting turned into fat.
Don't trust anything you read on bodybuilding, or 'nutritional supplement' sites. The info is often misrepresented, if not totally wrong.
I've just pulled out my Sherwood's Human Physiology book and looked over both the sleep section, and the metabolism section where it discusses muscle breakdown as an energy source. Neither mentioned normal muscle loss/breakdown durning sleep. It did mention, what I was about to say anyway, and that is that muscle breakdown is the last resort for your body. You'll go through fat and your livers sugar stores before it starts breaking down muscle to get more sugar.
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"Glory is fleeting, but obscurity is forever."
- Napoleon Bonaparte
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