I like how Tucker Peck (https://meditatewithtucker.com/, recommended, he has an online group) phrased it: when there's samadhi with not enough sampajanna, you're happy asshole. When there's sampajanna without samadhi, you can clearly see what's going on, but you can remain sad (not enough flow-induced pleasure, leaving the mind not strong enough).
In such case there's just enough mind unification to create the pleasure from the flow state, but not enough to expand the awareness and notice wtf is going on around (and for the mind to notice introspectively what it's doing).
Maybe you could try to be continuously aware of the pleasure (or rapture, to be more precise - piti) in your mind, and how the mind is clinging to it. It leads to realising that the rapture is still quite a growse and still somewhat stressful state of mind (it feels a bit like happy anxiety) and with time causes the mind to let it go and leave just the mental pleasure (sukha) or at least to make the piti component more integrated and refined. That's the idea of the Jhanas progression, but not many people know that samadhi is equally possible in day-to-day life, not just with eyes closed. Good for you :)
BTW please take what I'm saying with a grain of salt, I'm not hugely experienced.
PS. A great piece about it: http://dharmatreasure.org/wp-content/uploads/Meditation%20an...
Samadhi is completely different - referring to a deep meditation state without particularly concentrating on anything.
Flow results from deeply being engaged in something or concentration.
I've decided to roll with the punches and just work all-day, but take more days off. That way I can just go straight from flow to bed (with a few walks throughout the day). But I'll try to make sense of the sibling comments as well. Or maybe I just need to get better at napping again (right after work - a great reset button).
If you have links to other discussions of this, please share :)
In my experience, flow state tends to be toxic and socially harmful with time. After weeks of practicing, once you're in, there is no easy way to exit it without sleeping (in the morning you're at risk falling in there again). I discussed this effect elsewhere and it confirmed. Sometimes I forcefully retain my mind in normal mode with "expensive" focus, because further plans require to be communicable and alive. It is not "for free" to me in neither way.
Am I using it wrong? Is meditation and samadhi a better version of the flow in this regard?