Write the next sentence in the following story.

How to sleep while sitting up
Gather bedding.
If you have time to prepare before trying to sleep upright, gather bedding such as a blanket, pillows, towel, or a mat. This bedding will make you more comfortable, and reduce any soreness from sleeping upright.
Wearing loose, comfortable clothes and light shoes will also make it easier to sleep while sitting up. A special travel pillow can provide support for your head and neck.