I played with a baby black rough neck monitor once. Sweet animal, like a skittish kitten with scales. I gently stroked each side of his little neck and he was zoned out and in no time closed his eyes.
Yes, I phrased it like that to bug you.
Sorry, couldn't help it.
>>Please dont say because they usually close their eyes cause thats likely due to a natural reaction cause somethings close to their eye.
Good point, but not always.
First, he (or she, couldn't tell) kept his eyes open for a few minutes before shutting them. If it was due to the above said natural reaction to protect his eyes, he'd have closed them immediately. And a minute before he closed them, he blinked slowly, flickering his eyelids as if sleepy.
Second, his little body was quite relaxed. Not stiff.
Third, he wasn't clinging tensely to my hand. He was pretty relaxed. (needle sharp little toenails so if he dug in due to fear or discomfort, I'd still be nursing my hand)
Fourth, I've heard that if it's a defensive thing, it'd sometimes just be on the side that the stimulus is on. This isn't applicable to my situation as both his eyes were closed, but then I was petting his neck symmetrically. (I know I spelled that wrong).
Fifth, he was stretching his little neck out and if memory serves, resting it on my fingers
Hope this helps. 
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0.2 chickens
0.2 dog mutts (half ownership, only mine when they misbehave)
0.1 Halflinger horse
0.0 reptiles due to living with
1.1 parents
Still searching for 1.0 WC human