impact of metal on sleep function
Most of my books are stored on industrial type metal shelves, 4 floors up from my flat. I was there yesterday to weed out books to throw away or give away, checking on the calibre catalogue on my kobo aura which I had as an ebook and which not (I have some 4500 references on calibre, and am not always sure which I have as an epub as well as on paper).
Standing (on metal steps) while I screened the top shelves, I was surprised that the aura went to sleep on its own every time I laid it on the metal shelves (in its cover, folded). I had to hold it to keep it awake.
How come?
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