Yeah, I'd also recommend saving the diphenhydramine. I personally don't find any amount very enjoyable. It only makes me tired. However, I find that when I take a LOT I can't sleep at all, not that I feel stimulated in any way that's enjoyable. More like... irritable as hell. That all said, if you take it at all, take a smaller amount. 25-50mg. With the valium, you will probably sleep a-ok... with a reasonable dose of diphen before you intend on laying down.