If your loved one is a person of faith, consider bringing spiritual practices to him or her. Even if he or she isn't able to show much responsiveness, studies show that there's probably still a level of perception, and spiritual interactions can be deeply reassuring and relaxing.
Ask clergy to make a house call. Many will, especially when someone has a terminal illness.
Play or sing familiar hymns.
Read aloud from a Bible, book of prayers, or other book of faith.
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Hold makeshift bedside services.
Many people find spiritual solace in the outdoors, so you can also bring the outside in with plants, flowers, and a bird feeder hung outside the window -- introducing sounds and scents that bring solace.