I just happened to read this question on sleep with regards to deca and test...I have trouble sleeping when taking deca with test, but do not have as much trouble when I take test by itself. The problem has been difficult enough for me that I've even stopped taking deca for long periods simply because of my inability to sleep. I've tried various kinds of sleep aids and haven't been satisfied with any of them for very long (but as I understand it, all sleep aids are meant to provide temporary relief, not long term treatment). The best solution that I've come up with is to work damned hard in the gym the first several days after taking a shot, so as to tire my body out. This seems to work better for me than anything.