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If you do no like to turn over to have a look at your alarm it is nice that it is visible on the ceiling or wall.
Knowing how cold or warm it is when you wake up can be on your mind and answered instantly.
They make it very easy for you to find all the information you need when you have to wake up, or wake up in the middle of the night and wonder about it.
If you have plans that are based on the right outside conditions this can help you stay in bed and not having to get up and check it.