For me anyway, I find that there&#x27;s little link between the two. I sleep on average 4.5 hours and (I don&#x27;t think) it has effected in any way my mental health.<p>The biggest thing for me that completely changes my mood (not world caving in type, but noticable), is amounting external presures like obligation, deadlines, etc - the inescapable. I&#x27;ve learned to minimise these in my life, much to my happiness.<p>YMMV