I have used both restavit and phernergen for insomnia. I find restavit to be better, though phernergen will do in a pinch. I forget what dosage tablets I was taking of phernergen but I was taking 3 tablets.
For restavit I wouldn't take more than 2 tablets, 3 as an absolute maximum. the delirent effects start to be apparent around these dosages and the effects are just plain weird. not fun at all. restavit also has more of a grogginess the next day which I didn't really notice from phernergen.
Also to help you sleep, have a warm shower before bed, and have a cup of strong camomile tea or a cup of warm milk. cut back on the caffeine late in the day ect.
If you've been using alot of scripted sleeping aids like benzos or stilnox chances are it will take you a while before the over the counter sleeping aids work. so expect a few nights will little sleep.