That is not easy to answer because your body is unique, and different herbs have different properties, too, so you need to match the herb(s) to you. Here's an example from history: both King George III and Hitler had difficulty sleeping, and both consulted their physician about it. King George had a red face and tongue (indicating heat in his body) and was manic when he could not sleep; but Hitler had a white face (indicating cold in the body). Now, both hops and valerian can help one sleep, but not everyone. King George was given hops (it has cooling properties) and Hitler got valerian (it has warming properties). If this had been switched, it would have made things worse for both of them.
(I tend to get cold easily; eating ice cream in the winter is not something I do:))
Same thing with essential oils; know yourself, know the herbs, you will make a better match- not easy if not educated. I would highly suggest you seek out an herbalist to help you to save you time and money in the long run.