Supporting My Partner's Mom Through Lymphoma

My partner's mom has Lymphoma. She had it once, had chemo, came off of chemo and then somehow developed Lymphoma again. She and I have a relationship unlike any other person...but she doesn't know that. When I see her I can open up, talk with her, and connect with her beyond measure unlike anyone I've ever known. I don't even talk to my own mother as much as I talk to her. Is that weird? Anyway, the reason I typed this post is she just came out of the hospital. She said her sleeping pattern has been off the last couple days. Not from the nurses coming in and out every hour disturbing her throughout the night (though that might be the case) but what other reasons? So what medications or any other remedies can help her feel more comfortable? More importantly, help her not wake up every hour of the night? Thanks.