One problem with this approach is that if you've always had dysfunctional sleep, you don't understand what "feeling rested" really means. I had undiagnosed sleep apnea until my late 20s, and it was insane what a difference getting a CPAP made. I literally couldn't conceptualize how fatigued I had been all of my life until I had something to compare it against, and when I finally started getting restorative sleep my whole life changed.