Note sure if I can help much, other than I did experience complete 'burn out' when I was about 40. (see my profile re. latest )
So I have been 'totally wiped out' (not a breakdown). Hit me from nowhere and took about 6 months to recover (95%)
This was mental wipeout (I couldn't add 2 numbers together ), physically less impact.
I still struggle to mentally relax, I should try yoga ! however never preserved.
Are you sleeping from 8.15pm, until when ? or was this a once off. ? Solid sleep obviously should refresh (not if your waking , having to get up) I sleep solid for about 8 hrs ..
I try and listen to my mind and body a lot more since, I always wanted to 'burn' all my energy away I think (ie the battery was always being depleted, and was fine whilst I could keep it topped up !)
I'm semi retired, mainly because I want to spend time doing the things I enjoy - gardening, walking and family etc . It always concerned me - should I 'ease off' ? I'm on zero meds , and have a low alcohol and caffeine intake. I do lack energy reserves I feel (I'm only 62) and can't put my finger on why. ie I have to take breaks when digging for instance, yet I'm not out of breathe and resting HB is around 62 (I have a fitbit). I never sleep during day.
However things are getting no worst or better, if I push too hard, it does bite me back - ie a bit like 'ME' symptoms, so I tend to take things at a slower pace, both mentally and physically.
Hope this helps a little ..
Gordon - Devon