Personal needs vary, but also know that you can stabilize on chronic low sleep and not even know it. I did a few years getting ~6 hours most days, and felt ok. I eventually ended up getting 8-9 for quite a while (months), recovered, and now quite literally feel better than I knew I could.

A simple, funny example: I always thought I was prone to getting songs stuck in my head. It turns out I'm not unless I'm sleep deprived, but that was such a constant state that I never knew there was an alternative.