I think D has had quite a year and has made big strides in the last 3 or 4 months; he may well be feeling a bit " tuckered out" with all that is going on at the mo. You both should take some time to just
be. I know thats easy to say; not so easy to do
We all go through phases of lethargy especially at this time of year when spring seems to be taking forever here!!
Awareness is always good though, take care.