I also have this. It is so weird. I can improve dramatically overnight. It can't be vitamin D, because it is usually an overnight improvement, and I notice it once I wake up and before I have gone outside.
It can't be sunshine/light because again, I notice it when I wake up and before I leave the house (I have blackout blinds and curtains so usually, and a cool-cold house, so usually don't know what the weather is like before I pull up the blinds and pull back the curtains). There is a chance sunshine plays some sort of beneficial role as the summer roles on, but it can't account for the main benefit.
I have used a light box at time over the years (to try to help sleep reversal) and it doesn't have this effect.
It can't be mood (partly because my humour/mood isn't automatically better in the summer, and I don't have mood problems anyway, and my ME does not fluctuate depending on mood/outlook).
It is not heat, as I don't get the same benefit from being in a hot environment, though I do like to occassionally spend brief periods in a sauna (though I'm not sure that is so good for the ME). I generally feel worse if the central heating is on too high (if I am at someone else's house) and I deliberately keep the heating in my own place on the lower side of acceptable during the winter.
But what is it? So weird. Nothing else I have tried has had this effect for me. Unfortunately being in Ireland the weather is usually not good, with a lot of rain. So I have to enjoy it while I get it. We don't get much humid heat here where I am thankfully, and the sunshine days are usually a maximum of 25 degrees Celsius (77 degrees fahrenheit), and normally less, so not too hot either.
It can't be sunshine/light because again, I notice it when I wake up and before I leave the house (I have blackout blinds and curtains so usually, and a cool-cold house, so usually don't know what the weather is like before I pull up the blinds and pull back the curtains). There is a chance sunshine plays some sort of beneficial role as the summer roles on, but it can't account for the main benefit.
I have used a light box at time over the years (to try to help sleep reversal) and it doesn't have this effect.
It can't be mood (partly because my humour/mood isn't automatically better in the summer, and I don't have mood problems anyway, and my ME does not fluctuate depending on mood/outlook).
It is not heat, as I don't get the same benefit from being in a hot environment, though I do like to occassionally spend brief periods in a sauna (though I'm not sure that is so good for the ME). I generally feel worse if the central heating is on too high (if I am at someone else's house) and I deliberately keep the heating in my own place on the lower side of acceptable during the winter.
But what is it? So weird. Nothing else I have tried has had this effect for me. Unfortunately being in Ireland the weather is usually not good, with a lot of rain. So I have to enjoy it while I get it. We don't get much humid heat here where I am thankfully, and the sunshine days are usually a maximum of 25 degrees Celsius (77 degrees fahrenheit), and normally less, so not too hot either.