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I hope that helps.
Sleep is really, really important. I can't begin to say how important it is...depression often will cause you to sleep too much or too little, and either extreme is bad for you because BOTH will make the depression worse. Eating too little will also make the effects of depression worse, so it builds up over time like a snowball rolling down a hill.
I wish I could tell you how to go about talking to him, but you know him better than we do...good luck though.
Look at his actions decide "is he trying to get his life together?" Or is he doing the same as he has been for the last six months, now neglecting you with everything else?