Body pillows can be a great sleep aid but they tend to be fairly expensive. IKEA has a very affordable body pillow called the GOSA MÅBÄR which is about 3 ft long and is ideal for wrapping your arm or leg around to help maintain better posture while sleeping.
If you find yourself constantly reaching into high or low places, or if you have bad knees, the EZ reacher might just be the thing to prevent low back strain. I originally found this on Cool Tools, which gave it a favorable review for durability and ease of use. It might be the perfect thing to give an inflamed knee or back time to heal, especially after a surgery.
At Amazon for $17