DHEA is the quarterback of hormones. It can be tested with a blood test.

I take 12.5 mgs of DHEA daily. My T is low but T cream makes my face break out. If I take 25 mgs of DHEA, my face gets really oily. T can cause hair loss. DHEA does not appear to effect my hair. It got thin before I started the T or DHEA.

Sleeping 7 hours does not mean good restorative sleep. Not a comment on your sleep, just a comment about sleep. Eating right before bed can effect quality of sleep. Digestion takes a lot of energy. That energy could be taken from the energy your brain needs. You might consider a lighter meal before bed.