I certainly can’t blame you for being wary about consuming mugwort- it is one that is smart to be cautious of 
Perhaps as an alternative to drinking it, you could make the tea the same way you did before and then just tuck the mugwort into a Dream Pouch under your pillow. That way the mugwort is there working its effect, just externally instead of internally 
I would urge you to keep trying with it! Dreams can be tricky, fickle things. I usually don’t remember my dreams in the morning because my mundane worries flood in and wash away any dreams long before I’m awake enough to remember them. But naps, on the other hand- I usually have very vivid dreams during an afternoon nap.
Keep experimenting with recipes, spellwork, and schedule- I’m sure you’ll find the right combo that works best for you, Assyla! 
Wishing you all the best with it- sweet dreams! 