Can I take kava and valerian tea?

With caution. Whenever any 2 drugs or herbs are taken that can cause relaxation/sedation there can be an additive effect so you get more sedated than either alone- but this is probably the whole point of your wanting to take them together! it should be safe but use with caution and don't drive/do anything hazardous:http://www.Drugs.Com/drug-interactions/kava-with-valerian-root-2381-0-2284-10628.Html?Consumer=1.