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Created in 2008, Phoenix Rising is the largest and oldest forum dedicated to furthering the understanding of, and finding treatments for, complex chronic illnesses such as chronic fatigue syndrome (ME/CFS), fibromyalgia, long COVID, postural orthostatic tachycardia syndrome (POTS), mast cell activation syndrome (MCAS), and allied diseases.
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I'm useless for the first 5 or 6 hours after I wake up (which these days could be ANY time frankly!), getting gradually better later during the day, and generally feeling fine by bedtime, so that I too tend to stay up late just to get a few hours of productivity into my day. If I try to get to sleep at a 'normal' time, it doesn't help, because even if I'm not itching I generally can't sleep unless I'm properly tired. So nowadays I tend to just sleep whenever I'm tired and keep on working whenever I can.
So far, everybody seems to have the opposite pattern to SaveMe! IMO, the probable explanation is: we can't sleep properly, and in some respect sleep is actually exhausting for our bodies. There's the phrase "it's like your body is running a marathon every night while you're asleep", which seems to fit - something to do with cortisol and cytokines failing to switch off their activity, I think (?)
I am at my worst when I wake in the morning. I get progressively better as the day goes on until the late evening when I feel fairly normal. The only ups and downs during the day is after I eat a meal I feel very tired and it's only after the meal is digested does the improvement continue. After my evening meal has been digested I feel fairly well.