Definitely without a doubt. When I wake up in the morning and I feel like I'm having a good hair day I will kick start the day with an extra pep in my step. I feel more confident and happy and just secure, where as on bad hair days I feel like I want to just go back to bed and be alone. Most days are an in-between. However, I rarely have a genuinely GOOD OMG hair day. I did have one this past Friday, though. I woke up and took off my scarf and BAM....my hair from the previous night's cowash was just amazing. Smooth and healthy, and it listened so much as I brushed it neatly into better a sock bun. Everything was A++ on 1st attempt. Even my side bangs, which annoy me. Even the nape hair was awesome, fluffy and didn't need any pinning or anything. It was truly amazing. Definitely 1 of the best hair days I've had in a while. I started off Friday feeling fabulous. So yeah, hair definitely has a role in the mood I am in, as equally as the condition of my skin does (i.e. zits, oily skin, scars/blotches, black heads, etc.).