What is the status of a non-cloth covering, such as putting your head on your watch?
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the reason for leaning forward when saying tachnun is one should fall on one's face in shame for sins committed. the arizal held the hand was no enough of a cover and should use one's arm (not tefillin arm) however that one should not use one's bear flesh as one's arm cannot sufficiently be a cover for one's face when leaning forward. In my siddur it mentions a sleeve or tallis but that assumes one is wearing a talis and one isn't wearing a short sleeve shirt. according to many ideally one would be wearing a jacket during davening which would solve that problem but not everyone does, but then again neither does everyone hold like that arizal that the hand is not enough of a cover for tachnun. assuming though one is in the position of using one's forearm and having a short sleeve shirt it could be that one would be able to use anything to cover one's arm such as a paper towel. I don't think the watch would be a sufficient cover if the hand is not. While I haven't seen a source for it would there be any reason one couldn't rest your forehead on an object such as a chair or edge of a table in this situation?