Final answer:
The nurse teaches Alexander to sleep in the left lateral position for pressure relief at night.
Step-by-step explanation:
Pressure relief at night can be achieved by sleeping in the left lateral (on the left side) position. This position helps to alleviate pressure on certain areas of the body, such as the back and hips, and promotes good blood circulation. Sleeping in the supine (on the back) position may not be ideal for pressure relief as it can sometimes lead to obstructed airways and sleep apnea, while sleeping in the prone (on the stomach) position may cause strain on the neck and spine.