my thought is that if one's meditation ever has a trace of dullness or a spaced-out quality to it,then its not real meditation.
real meditation is hyper lucidity and awareness. its like an ai which can do 10,000 difficult things at once.
the cool sensation inducing pleasant sensation is common. dont you think that its from settling into the present moment slightly?
How to incorporate more clarity, awareness, and mindfulness?
once meditation gets decent the enemy becomes subtle dullness, into which a meditator can space out for long periods of time. during this time the meditation object is not lost, but it has no brightness or lucidity to it. its tricky because your mind is on alert for losing the object but since the object is no longer easily lost the watchfulness just sits there and gets fatigued, thus the brightness of the object fades without notice. so, one of the necessary skills for achieving shamata is countering this subtle dullness (gross dullness being the losing or forgetting of the object completely) by recognizing it and watching for it as well.
A Japanese man has been arrested on suspicion of writing a computer virus that destroys and replaces files on a victim PC with manga images of squid, octopuses and sea urchins. Masato Nakatsuji, 27, of Izumisano, Osaka Prefecture, was quoted as telling police: "I wanted to see how much my computer programming skills had improved since the last time I was arrested."