Why is it that everytime I tilt my team leader, my eyes river profusely?

I use my laptop lying down and I watch TV lying down, When I'm on my side, or I'm looking to the side, my eye water like I'm crying.
times even liking my head on my hand can result in a trail of tears.

Sometimes they sting, but most of the time, there's no stinging, and no point why they should be watering. It's not that I stay on the computer long. They start watering within minutes.

Do you have some idea of what's going on?
Answers:    same entity happens to me a little

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