Could be me/cfs, the defining feature is unrefreshing sleep but also "crashing" after overexertion, usually a day later. As mentioned you should look at r/cfs.

Could be me/cfs, the defining feature is unrefreshing sleep but also "crashing" after overexertion, usually a day later. As mentioned you should look at r/cfs. Many people with cfs like myself have found Low Dose Naltrexone (LDN) useful, but it's not widely known about.