This is also a very strange claim to make. I am pretty sure that you should be surprised - the anti-depressant/sleep thing is well known in part because it's so unique: I've never heard of even a single study finding sleep deprivation to be a striking temporary treatment for schizophrenia, autism, bipolar disorder, psychopathy, etc, all of which are influenced by 'thousands and thousands of genes, filtered through [etc]', the way it is for depression to the point of being meta-analyzable. (And if they exist, I don't recall them being mentioned anywhere in the sleep/depression papers.) It's a really strange finding!