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I don't know if this'll be totally appropriate, but I love listening to the OST of Silent Hill 2 at night. The pieces aren't 'soothing' but they're very ambient and abstract. The subtleness of each song really gets to you. Give it a listen.
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I'll recommend this as well. Although it may do more to keep you awake than put you to sleep, listening to Akira Yamaoka's compositions for the Silent Hill series in darker, quieter settings (such as when you're in bed, about to fall asleep) makes for a unique experience. Silent Hill 2 is great and all, but personally, Silent Hill 4 has had more of an effect on me.
For the most part, the vocal tracks don't evoke the same effect (one exception is Room of Angel from SH4), but they all make for some excellent standalone listening anyway.
Jam it back in, in the dark.