Probably a combination of the heat wave and lack of sleep, sounds sensible to sit it out today.
I’m generally fine on day one, not too bad on day two, then struggle on day three before (if I’m lucky) feeling better on day four. If I don’t reach the feeling better on day four then there isn’t generally a day five.
I’ve just decided, having finished my 100 squats a day for the whole of June, that July will be a yoga every day challenge - even if for only ten mins.