Go and have a read here Common krait - Wikipedia, the free encyclopedia
... occasionally biting the source of the annoyance.
... it is reluctant to bite
It says this:
If bitten by a krait while sleeping, a victim may not realize he has been bitten, as the bite feels like of an ant or mosquito.
You are kidding, right?It also says:
Inference?
I've heard from a few folks that they usually stay under the pillow getting coiled up and then bite.
Loved the greenery in pic you posted.Somewhere in the border of Western Ghats,Karnataka.