Travelsafar I have days when I feel exactly as you do. I give in and do what I feel like. I’m not a going back to bed person really, so I don’t do that, but I might have a long soak in the bath, do my nails or anything at all. So if a duvet day is what you fancy, have one.
Having said that, I have 3 lists.
One is ‘must be done today or tomorrow’ eg send a birthday card, pay a bill, water the plants, put a load of washing on.
Second is ‘need to be done in the next week or so’ - things that it would be good to get done but not immediately urgent eg tax return.
Third is long term aims - eg digitising old photographs, sorting stuff out.
Crossing any of those off, or even partly off, is a source of satisfaction.
But at our age, it’s nice to feel that if you need a self-indulgent day, we can have one without feeling guilty about it.
I usually find my energy comes back the next day.