I see post exertional exacerbation of symptoms described often as delayed. I am bedridden 24/7 and I have immediate exacerbation of global symptoms if I go over my very strict activity limits. If I go over them considerably I will then not return to my baseline level of symptoms the next day but risk dipping below my baseline for days, weeks or longer. In the years when I was moderate I'd experience this combination of immediate and delayed too. Just interested if I am missing something in not relating to it being described as only delayed.