Personally I find evenings a bit different, in that I’m sufficiently worn out mentally from the day that I no longer can think (productively) about work — and so the worries of the upcoming day are temporarily shelved for lack of practical progress to be made on them. Through no particular mental effort on my part, it is easy to relax in the evenings.
But in the mornings, I’m fresh enough that that doesn’t work. I can, through an act of willpower and mindfulness, intentionally forget that work is a thing I’ll have to be doing in a few hours, and so just enjoy my mornings like you do — but this was a skill I learned, and I didn’t always have it; and moreover, I suspect it’s a skill many people never develop.