Recently my scalp was itching just a tad, so I decide to try something I've heard about on these natural hair blogs - apply tea tree oil. The next thing I know (3 hours later), I can't stay asleep because my scalp is on fire. So, I decide to apply more tea tree oil. After all, it's supposed to help with itchy scalp, right? 2 hours later with no sleep, I decide to search online for what I was doing wrong. I thought I had an allergic reaction.