Letter Re: Light Blocking Suggestions for Windows

Hi,
Here in Alaska, people often block incoming light with a single layer of aluminum foil.. the kind from the supermarket.  It is difficult to sleep here in summer when the sun never sleeps.  This same method would work to keep light in. 

Advantages:
Inexpensive
light weight
easy to store
non-permanent
non-toxic

Regards, – Carol S.

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