I was sleeping on a few pillows to try to prop my head up, but as they'd sink down in the night I'd feel like I was suffocating. I got a memory foam pillow to bolster the stack of regular pillows, so my head is at least 6 inches higher than the rest of me through the night. I think it feels better. With OI it seems best to reduce the radical changes in body angle throughout the day and night. So never lying completely flat at night and finding ways to recline when awake would lessen the strain of changing between angles. I'm of mixed opinion about how much salt/potassium to eat. Some dulse and sea salt broth in the morning makes me feel better, as does salt throughout the day. If I take salt in the evening sometimes I get a headache lying down at night. I haven't found a way yet to endure long stretches of standing, or of being able to concentrate for several hours sitting up like I used to.